Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_syscalls.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include "opt_capsicum.h" 43 #include "opt_ktrace.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/capsicum.h> 50 #include <sys/disk.h> 51 #include <sys/sysent.h> 52 #include <sys/malloc.h> 53 #include <sys/mount.h> 54 #include <sys/mutex.h> 55 #include <sys/sysproto.h> 56 #include <sys/namei.h> 57 #include <sys/filedesc.h> 58 #include <sys/kernel.h> 59 #include <sys/fcntl.h> 60 #include <sys/file.h> 61 #include <sys/filio.h> 62 #include <sys/limits.h> 63 #include <sys/linker.h> 64 #include <sys/rwlock.h> 65 #include <sys/sdt.h> 66 #include <sys/stat.h> 67 #include <sys/sx.h> 68 #include <sys/unistd.h> 69 #include <sys/vnode.h> 70 #include <sys/priv.h> 71 #include <sys/proc.h> 72 #include <sys/dirent.h> 73 #include <sys/jail.h> 74 #include <sys/syscallsubr.h> 75 #include <sys/sysctl.h> 76 #ifdef KTRACE 77 #include <sys/ktrace.h> 78 #endif 79 80 #include <machine/stdarg.h> 81 82 #include <security/audit/audit.h> 83 #include <security/mac/mac_framework.h> 84 85 #include <vm/vm.h> 86 #include <vm/vm_object.h> 87 #include <vm/vm_page.h> 88 #include <vm/uma.h> 89 90 #include <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 static uint64_t 118 at2cnpflags(u_int at_flags, u_int mask) 119 { 120 u_int64_t res; 121 122 MPASS((at_flags & (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)) != 123 (AT_SYMLINK_FOLLOW | AT_SYMLINK_NOFOLLOW)); 124 125 res = 0; 126 at_flags &= mask; 127 if ((at_flags & AT_RESOLVE_BENEATH) != 0) 128 res |= RBENEATH; 129 if ((at_flags & AT_SYMLINK_FOLLOW) != 0) 130 res |= FOLLOW; 131 /* NOFOLLOW is pseudo flag */ 132 if ((mask & AT_SYMLINK_NOFOLLOW) != 0) { 133 res |= (at_flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : 134 FOLLOW; 135 } 136 return (res); 137 } 138 139 /* 140 * Sync each mounted filesystem. 141 */ 142 #ifndef _SYS_SYSPROTO_H_ 143 struct sync_args { 144 int dummy; 145 }; 146 #endif 147 /* ARGSUSED */ 148 int 149 sys_sync(struct thread *td, struct sync_args *uap) 150 { 151 struct mount *mp, *nmp; 152 int save; 153 154 mtx_lock(&mountlist_mtx); 155 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 156 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 157 nmp = TAILQ_NEXT(mp, mnt_list); 158 continue; 159 } 160 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 161 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 162 save = curthread_pflags_set(TDP_SYNCIO); 163 vfs_msync(mp, MNT_NOWAIT); 164 VFS_SYNC(mp, MNT_NOWAIT); 165 curthread_pflags_restore(save); 166 vn_finished_write(mp); 167 } 168 mtx_lock(&mountlist_mtx); 169 nmp = TAILQ_NEXT(mp, mnt_list); 170 vfs_unbusy(mp); 171 } 172 mtx_unlock(&mountlist_mtx); 173 return (0); 174 } 175 176 /* 177 * Change filesystem quotas. 178 */ 179 #ifndef _SYS_SYSPROTO_H_ 180 struct quotactl_args { 181 char *path; 182 int cmd; 183 int uid; 184 caddr_t arg; 185 }; 186 #endif 187 int 188 sys_quotactl(struct thread *td, struct quotactl_args *uap) 189 { 190 struct mount *mp; 191 struct nameidata nd; 192 int error; 193 194 AUDIT_ARG_CMD(uap->cmd); 195 AUDIT_ARG_UID(uap->uid); 196 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 197 return (EPERM); 198 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 199 uap->path, td); 200 if ((error = namei(&nd)) != 0) 201 return (error); 202 NDFREE(&nd, NDF_ONLY_PNBUF); 203 mp = nd.ni_vp->v_mount; 204 vfs_ref(mp); 205 vput(nd.ni_vp); 206 error = vfs_busy(mp, 0); 207 vfs_rel(mp); 208 if (error != 0) 209 return (error); 210 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); 211 212 /* 213 * Since quota on operation typically needs to open quota 214 * file, the Q_QUOTAON handler needs to unbusy the mount point 215 * before calling into namei. Otherwise, unmount might be 216 * started between two vfs_busy() invocations (first is our, 217 * second is from mount point cross-walk code in lookup()), 218 * causing deadlock. 219 * 220 * Require that Q_QUOTAON handles the vfs_busy() reference on 221 * its own, always returning with ubusied mount point. 222 */ 223 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON && 224 (uap->cmd >> SUBCMDSHIFT) != Q_QUOTAOFF) 225 vfs_unbusy(mp); 226 return (error); 227 } 228 229 /* 230 * Used by statfs conversion routines to scale the block size up if 231 * necessary so that all of the block counts are <= 'max_size'. Note 232 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 233 * value of 'n'. 234 */ 235 void 236 statfs_scale_blocks(struct statfs *sf, long max_size) 237 { 238 uint64_t count; 239 int shift; 240 241 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 242 243 /* 244 * Attempt to scale the block counts to give a more accurate 245 * overview to userland of the ratio of free space to used 246 * space. To do this, find the largest block count and compute 247 * a divisor that lets it fit into a signed integer <= max_size. 248 */ 249 if (sf->f_bavail < 0) 250 count = -sf->f_bavail; 251 else 252 count = sf->f_bavail; 253 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 254 if (count <= max_size) 255 return; 256 257 count >>= flsl(max_size); 258 shift = 0; 259 while (count > 0) { 260 shift++; 261 count >>=1; 262 } 263 264 sf->f_bsize <<= shift; 265 sf->f_blocks >>= shift; 266 sf->f_bfree >>= shift; 267 sf->f_bavail >>= shift; 268 } 269 270 static int 271 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 272 { 273 struct statfs *sp; 274 int error; 275 276 if (mp == NULL) 277 return (EBADF); 278 error = vfs_busy(mp, 0); 279 vfs_rel(mp); 280 if (error != 0) 281 return (error); 282 #ifdef MAC 283 error = mac_mount_check_stat(td->td_ucred, mp); 284 if (error != 0) 285 goto out; 286 #endif 287 /* 288 * Set these in case the underlying filesystem fails to do so. 289 */ 290 sp = &mp->mnt_stat; 291 sp->f_version = STATFS_VERSION; 292 sp->f_namemax = NAME_MAX; 293 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 294 error = VFS_STATFS(mp, sp); 295 if (error != 0) 296 goto out; 297 *buf = *sp; 298 if (priv_check(td, PRIV_VFS_GENERATION)) { 299 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 300 prison_enforce_statfs(td->td_ucred, mp, buf); 301 } 302 out: 303 vfs_unbusy(mp); 304 return (error); 305 } 306 307 /* 308 * Get filesystem statistics. 309 */ 310 #ifndef _SYS_SYSPROTO_H_ 311 struct statfs_args { 312 char *path; 313 struct statfs *buf; 314 }; 315 #endif 316 int 317 sys_statfs(struct thread *td, struct statfs_args *uap) 318 { 319 struct statfs *sfp; 320 int error; 321 322 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 323 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 324 if (error == 0) 325 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 326 free(sfp, M_STATFS); 327 return (error); 328 } 329 330 int 331 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg, 332 struct statfs *buf) 333 { 334 struct mount *mp; 335 struct nameidata nd; 336 int error; 337 338 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 339 pathseg, path, td); 340 error = namei(&nd); 341 if (error != 0) 342 return (error); 343 mp = nd.ni_vp->v_mount; 344 vfs_ref(mp); 345 NDFREE(&nd, NDF_ONLY_PNBUF); 346 vput(nd.ni_vp); 347 return (kern_do_statfs(td, mp, buf)); 348 } 349 350 /* 351 * Get filesystem statistics. 352 */ 353 #ifndef _SYS_SYSPROTO_H_ 354 struct fstatfs_args { 355 int fd; 356 struct statfs *buf; 357 }; 358 #endif 359 int 360 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 361 { 362 struct statfs *sfp; 363 int error; 364 365 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 366 error = kern_fstatfs(td, uap->fd, sfp); 367 if (error == 0) 368 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 369 free(sfp, M_STATFS); 370 return (error); 371 } 372 373 int 374 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 375 { 376 struct file *fp; 377 struct mount *mp; 378 struct vnode *vp; 379 int error; 380 381 AUDIT_ARG_FD(fd); 382 error = getvnode(td, fd, &cap_fstatfs_rights, &fp); 383 if (error != 0) 384 return (error); 385 vp = fp->f_vnode; 386 vn_lock(vp, LK_SHARED | LK_RETRY); 387 #ifdef AUDIT 388 AUDIT_ARG_VNODE1(vp); 389 #endif 390 mp = vp->v_mount; 391 if (mp != NULL) 392 vfs_ref(mp); 393 VOP_UNLOCK(vp, 0); 394 fdrop(fp, td); 395 return (kern_do_statfs(td, mp, buf)); 396 } 397 398 /* 399 * Get statistics on all filesystems. 400 */ 401 #ifndef _SYS_SYSPROTO_H_ 402 struct getfsstat_args { 403 struct statfs *buf; 404 long bufsize; 405 int mode; 406 }; 407 #endif 408 int 409 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 410 { 411 size_t count; 412 int error; 413 414 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 415 return (EINVAL); 416 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 417 UIO_USERSPACE, uap->mode); 418 if (error == 0) 419 td->td_retval[0] = count; 420 return (error); 421 } 422 423 /* 424 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 425 * The caller is responsible for freeing memory which will be allocated 426 * in '*buf'. 427 */ 428 int 429 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 430 size_t *countp, enum uio_seg bufseg, int mode) 431 { 432 struct mount *mp, *nmp; 433 struct statfs *sfsp, *sp, *sptmp, *tofree; 434 size_t count, maxcount; 435 int error; 436 437 switch (mode) { 438 case MNT_WAIT: 439 case MNT_NOWAIT: 440 break; 441 default: 442 if (bufseg == UIO_SYSSPACE) 443 *buf = NULL; 444 return (EINVAL); 445 } 446 restart: 447 maxcount = bufsize / sizeof(struct statfs); 448 if (bufsize == 0) { 449 sfsp = NULL; 450 tofree = NULL; 451 } else if (bufseg == UIO_USERSPACE) { 452 sfsp = *buf; 453 tofree = NULL; 454 } else /* if (bufseg == UIO_SYSSPACE) */ { 455 count = 0; 456 mtx_lock(&mountlist_mtx); 457 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 458 count++; 459 } 460 mtx_unlock(&mountlist_mtx); 461 if (maxcount > count) 462 maxcount = count; 463 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 464 M_STATFS, M_WAITOK); 465 } 466 count = 0; 467 mtx_lock(&mountlist_mtx); 468 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 469 if (prison_canseemount(td->td_ucred, mp) != 0) { 470 nmp = TAILQ_NEXT(mp, mnt_list); 471 continue; 472 } 473 #ifdef MAC 474 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 475 nmp = TAILQ_NEXT(mp, mnt_list); 476 continue; 477 } 478 #endif 479 if (mode == MNT_WAIT) { 480 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 481 /* 482 * If vfs_busy() failed, and MBF_NOWAIT 483 * wasn't passed, then the mp is gone. 484 * Furthermore, because of MBF_MNTLSTLOCK, 485 * the mountlist_mtx was dropped. We have 486 * no other choice than to start over. 487 */ 488 mtx_unlock(&mountlist_mtx); 489 free(tofree, M_STATFS); 490 goto restart; 491 } 492 } else { 493 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 494 nmp = TAILQ_NEXT(mp, mnt_list); 495 continue; 496 } 497 } 498 if (sfsp != NULL && count < maxcount) { 499 sp = &mp->mnt_stat; 500 /* 501 * Set these in case the underlying filesystem 502 * fails to do so. 503 */ 504 sp->f_version = STATFS_VERSION; 505 sp->f_namemax = NAME_MAX; 506 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 507 /* 508 * If MNT_NOWAIT is specified, do not refresh 509 * the fsstat cache. 510 */ 511 if (mode != MNT_NOWAIT) { 512 error = VFS_STATFS(mp, sp); 513 if (error != 0) { 514 mtx_lock(&mountlist_mtx); 515 nmp = TAILQ_NEXT(mp, mnt_list); 516 vfs_unbusy(mp); 517 continue; 518 } 519 } 520 if (priv_check(td, PRIV_VFS_GENERATION)) { 521 sptmp = malloc(sizeof(struct statfs), M_STATFS, 522 M_WAITOK); 523 *sptmp = *sp; 524 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 525 prison_enforce_statfs(td->td_ucred, mp, sptmp); 526 sp = sptmp; 527 } else 528 sptmp = NULL; 529 if (bufseg == UIO_SYSSPACE) { 530 bcopy(sp, sfsp, sizeof(*sp)); 531 free(sptmp, M_STATFS); 532 } else /* if (bufseg == UIO_USERSPACE) */ { 533 error = copyout(sp, sfsp, sizeof(*sp)); 534 free(sptmp, M_STATFS); 535 if (error != 0) { 536 vfs_unbusy(mp); 537 return (error); 538 } 539 } 540 sfsp++; 541 } 542 count++; 543 mtx_lock(&mountlist_mtx); 544 nmp = TAILQ_NEXT(mp, mnt_list); 545 vfs_unbusy(mp); 546 } 547 mtx_unlock(&mountlist_mtx); 548 if (sfsp != NULL && count > maxcount) 549 *countp = maxcount; 550 else 551 *countp = count; 552 return (0); 553 } 554 555 #ifdef COMPAT_FREEBSD4 556 /* 557 * Get old format filesystem statistics. 558 */ 559 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 560 561 #ifndef _SYS_SYSPROTO_H_ 562 struct freebsd4_statfs_args { 563 char *path; 564 struct ostatfs *buf; 565 }; 566 #endif 567 int 568 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 569 { 570 struct ostatfs osb; 571 struct statfs *sfp; 572 int error; 573 574 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 575 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 576 if (error == 0) { 577 freebsd4_cvtstatfs(sfp, &osb); 578 error = copyout(&osb, uap->buf, sizeof(osb)); 579 } 580 free(sfp, M_STATFS); 581 return (error); 582 } 583 584 /* 585 * Get filesystem statistics. 586 */ 587 #ifndef _SYS_SYSPROTO_H_ 588 struct freebsd4_fstatfs_args { 589 int fd; 590 struct ostatfs *buf; 591 }; 592 #endif 593 int 594 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 595 { 596 struct ostatfs osb; 597 struct statfs *sfp; 598 int error; 599 600 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 601 error = kern_fstatfs(td, uap->fd, sfp); 602 if (error == 0) { 603 freebsd4_cvtstatfs(sfp, &osb); 604 error = copyout(&osb, uap->buf, sizeof(osb)); 605 } 606 free(sfp, M_STATFS); 607 return (error); 608 } 609 610 /* 611 * Get statistics on all filesystems. 612 */ 613 #ifndef _SYS_SYSPROTO_H_ 614 struct freebsd4_getfsstat_args { 615 struct ostatfs *buf; 616 long bufsize; 617 int mode; 618 }; 619 #endif 620 int 621 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 622 { 623 struct statfs *buf, *sp; 624 struct ostatfs osb; 625 size_t count, size; 626 int error; 627 628 if (uap->bufsize < 0) 629 return (EINVAL); 630 count = uap->bufsize / sizeof(struct ostatfs); 631 if (count > SIZE_MAX / sizeof(struct statfs)) 632 return (EINVAL); 633 size = count * sizeof(struct statfs); 634 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 635 uap->mode); 636 if (error == 0) 637 td->td_retval[0] = count; 638 if (size != 0) { 639 sp = buf; 640 while (count != 0 && error == 0) { 641 freebsd4_cvtstatfs(sp, &osb); 642 error = copyout(&osb, uap->buf, sizeof(osb)); 643 sp++; 644 uap->buf++; 645 count--; 646 } 647 free(buf, M_STATFS); 648 } 649 return (error); 650 } 651 652 /* 653 * Implement fstatfs() for (NFS) file handles. 654 */ 655 #ifndef _SYS_SYSPROTO_H_ 656 struct freebsd4_fhstatfs_args { 657 struct fhandle *u_fhp; 658 struct ostatfs *buf; 659 }; 660 #endif 661 int 662 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 663 { 664 struct ostatfs osb; 665 struct statfs *sfp; 666 fhandle_t fh; 667 int error; 668 669 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 670 if (error != 0) 671 return (error); 672 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 673 error = kern_fhstatfs(td, fh, sfp); 674 if (error == 0) { 675 freebsd4_cvtstatfs(sfp, &osb); 676 error = copyout(&osb, uap->buf, sizeof(osb)); 677 } 678 free(sfp, M_STATFS); 679 return (error); 680 } 681 682 /* 683 * Convert a new format statfs structure to an old format statfs structure. 684 */ 685 static void 686 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 687 { 688 689 statfs_scale_blocks(nsp, LONG_MAX); 690 bzero(osp, sizeof(*osp)); 691 osp->f_bsize = nsp->f_bsize; 692 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 693 osp->f_blocks = nsp->f_blocks; 694 osp->f_bfree = nsp->f_bfree; 695 osp->f_bavail = nsp->f_bavail; 696 osp->f_files = MIN(nsp->f_files, LONG_MAX); 697 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 698 osp->f_owner = nsp->f_owner; 699 osp->f_type = nsp->f_type; 700 osp->f_flags = nsp->f_flags; 701 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 702 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 703 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 704 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 705 strlcpy(osp->f_fstypename, nsp->f_fstypename, 706 MIN(MFSNAMELEN, OMFSNAMELEN)); 707 strlcpy(osp->f_mntonname, nsp->f_mntonname, 708 MIN(MNAMELEN, OMNAMELEN)); 709 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 710 MIN(MNAMELEN, OMNAMELEN)); 711 osp->f_fsid = nsp->f_fsid; 712 } 713 #endif /* COMPAT_FREEBSD4 */ 714 715 #if defined(COMPAT_FREEBSD11) 716 /* 717 * Get old format filesystem statistics. 718 */ 719 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 720 721 int 722 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 723 { 724 struct freebsd11_statfs osb; 725 struct statfs *sfp; 726 int error; 727 728 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 729 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 730 if (error == 0) { 731 freebsd11_cvtstatfs(sfp, &osb); 732 error = copyout(&osb, uap->buf, sizeof(osb)); 733 } 734 free(sfp, M_STATFS); 735 return (error); 736 } 737 738 /* 739 * Get filesystem statistics. 740 */ 741 int 742 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 743 { 744 struct freebsd11_statfs osb; 745 struct statfs *sfp; 746 int error; 747 748 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 749 error = kern_fstatfs(td, uap->fd, sfp); 750 if (error == 0) { 751 freebsd11_cvtstatfs(sfp, &osb); 752 error = copyout(&osb, uap->buf, sizeof(osb)); 753 } 754 free(sfp, M_STATFS); 755 return (error); 756 } 757 758 /* 759 * Get statistics on all filesystems. 760 */ 761 int 762 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 763 { 764 struct freebsd11_statfs osb; 765 struct statfs *buf, *sp; 766 size_t count, size; 767 int error; 768 769 count = uap->bufsize / sizeof(struct ostatfs); 770 size = count * sizeof(struct statfs); 771 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 772 uap->mode); 773 if (error == 0) 774 td->td_retval[0] = count; 775 if (size > 0) { 776 sp = buf; 777 while (count > 0 && error == 0) { 778 freebsd11_cvtstatfs(sp, &osb); 779 error = copyout(&osb, uap->buf, sizeof(osb)); 780 sp++; 781 uap->buf++; 782 count--; 783 } 784 free(buf, M_STATFS); 785 } 786 return (error); 787 } 788 789 /* 790 * Implement fstatfs() for (NFS) file handles. 791 */ 792 int 793 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 794 { 795 struct freebsd11_statfs osb; 796 struct statfs *sfp; 797 fhandle_t fh; 798 int error; 799 800 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 801 if (error) 802 return (error); 803 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 804 error = kern_fhstatfs(td, fh, sfp); 805 if (error == 0) { 806 freebsd11_cvtstatfs(sfp, &osb); 807 error = copyout(&osb, uap->buf, sizeof(osb)); 808 } 809 free(sfp, M_STATFS); 810 return (error); 811 } 812 813 /* 814 * Convert a new format statfs structure to an old format statfs structure. 815 */ 816 static void 817 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 818 { 819 820 bzero(osp, sizeof(*osp)); 821 osp->f_version = FREEBSD11_STATFS_VERSION; 822 osp->f_type = nsp->f_type; 823 osp->f_flags = nsp->f_flags; 824 osp->f_bsize = nsp->f_bsize; 825 osp->f_iosize = nsp->f_iosize; 826 osp->f_blocks = nsp->f_blocks; 827 osp->f_bfree = nsp->f_bfree; 828 osp->f_bavail = nsp->f_bavail; 829 osp->f_files = nsp->f_files; 830 osp->f_ffree = nsp->f_ffree; 831 osp->f_syncwrites = nsp->f_syncwrites; 832 osp->f_asyncwrites = nsp->f_asyncwrites; 833 osp->f_syncreads = nsp->f_syncreads; 834 osp->f_asyncreads = nsp->f_asyncreads; 835 osp->f_namemax = nsp->f_namemax; 836 osp->f_owner = nsp->f_owner; 837 osp->f_fsid = nsp->f_fsid; 838 strlcpy(osp->f_fstypename, nsp->f_fstypename, 839 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 840 strlcpy(osp->f_mntonname, nsp->f_mntonname, 841 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 842 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 843 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 844 } 845 #endif /* COMPAT_FREEBSD11 */ 846 847 /* 848 * Change current working directory to a given file descriptor. 849 */ 850 #ifndef _SYS_SYSPROTO_H_ 851 struct fchdir_args { 852 int fd; 853 }; 854 #endif 855 int 856 sys_fchdir(struct thread *td, struct fchdir_args *uap) 857 { 858 struct vnode *vp, *tdp; 859 struct mount *mp; 860 struct file *fp; 861 int error; 862 863 AUDIT_ARG_FD(uap->fd); 864 error = getvnode(td, uap->fd, &cap_fchdir_rights, 865 &fp); 866 if (error != 0) 867 return (error); 868 vp = fp->f_vnode; 869 vrefact(vp); 870 fdrop(fp, td); 871 vn_lock(vp, LK_SHARED | LK_RETRY); 872 AUDIT_ARG_VNODE1(vp); 873 error = change_dir(vp, td); 874 while (!error && (mp = vp->v_mountedhere) != NULL) { 875 if (vfs_busy(mp, 0)) 876 continue; 877 error = VFS_ROOT(mp, LK_SHARED, &tdp); 878 vfs_unbusy(mp); 879 if (error != 0) 880 break; 881 vput(vp); 882 vp = tdp; 883 } 884 if (error != 0) { 885 vput(vp); 886 return (error); 887 } 888 VOP_UNLOCK(vp, 0); 889 pwd_chdir(td, vp); 890 return (0); 891 } 892 893 /* 894 * Change current working directory (``.''). 895 */ 896 #ifndef _SYS_SYSPROTO_H_ 897 struct chdir_args { 898 char *path; 899 }; 900 #endif 901 int 902 sys_chdir(struct thread *td, struct chdir_args *uap) 903 { 904 905 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 906 } 907 908 int 909 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg) 910 { 911 struct nameidata nd; 912 int error; 913 914 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 915 pathseg, path, td); 916 if ((error = namei(&nd)) != 0) 917 return (error); 918 if ((error = change_dir(nd.ni_vp, td)) != 0) { 919 vput(nd.ni_vp); 920 NDFREE(&nd, NDF_ONLY_PNBUF); 921 return (error); 922 } 923 VOP_UNLOCK(nd.ni_vp, 0); 924 NDFREE(&nd, NDF_ONLY_PNBUF); 925 pwd_chdir(td, nd.ni_vp); 926 return (0); 927 } 928 929 /* 930 * Change notion of root (``/'') directory. 931 */ 932 #ifndef _SYS_SYSPROTO_H_ 933 struct chroot_args { 934 char *path; 935 }; 936 #endif 937 int 938 sys_chroot(struct thread *td, struct chroot_args *uap) 939 { 940 struct nameidata nd; 941 int error; 942 943 error = priv_check(td, PRIV_VFS_CHROOT); 944 if (error != 0) 945 return (error); 946 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 947 UIO_USERSPACE, uap->path, td); 948 error = namei(&nd); 949 if (error != 0) 950 goto error; 951 error = change_dir(nd.ni_vp, td); 952 if (error != 0) 953 goto e_vunlock; 954 #ifdef MAC 955 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 956 if (error != 0) 957 goto e_vunlock; 958 #endif 959 VOP_UNLOCK(nd.ni_vp, 0); 960 error = pwd_chroot(td, nd.ni_vp); 961 vrele(nd.ni_vp); 962 NDFREE(&nd, NDF_ONLY_PNBUF); 963 return (error); 964 e_vunlock: 965 vput(nd.ni_vp); 966 error: 967 NDFREE(&nd, NDF_ONLY_PNBUF); 968 return (error); 969 } 970 971 /* 972 * Common routine for chroot and chdir. Callers must provide a locked vnode 973 * instance. 974 */ 975 int 976 change_dir(struct vnode *vp, struct thread *td) 977 { 978 #ifdef MAC 979 int error; 980 #endif 981 982 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 983 if (vp->v_type != VDIR) 984 return (ENOTDIR); 985 #ifdef MAC 986 error = mac_vnode_check_chdir(td->td_ucred, vp); 987 if (error != 0) 988 return (error); 989 #endif 990 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 991 } 992 993 static __inline void 994 flags_to_rights(int flags, cap_rights_t *rightsp) 995 { 996 997 if (flags & O_EXEC) { 998 cap_rights_set(rightsp, CAP_FEXECVE); 999 } else { 1000 switch ((flags & O_ACCMODE)) { 1001 case O_RDONLY: 1002 cap_rights_set(rightsp, CAP_READ); 1003 break; 1004 case O_RDWR: 1005 cap_rights_set(rightsp, CAP_READ); 1006 /* FALLTHROUGH */ 1007 case O_WRONLY: 1008 cap_rights_set(rightsp, CAP_WRITE); 1009 if (!(flags & (O_APPEND | O_TRUNC))) 1010 cap_rights_set(rightsp, CAP_SEEK); 1011 break; 1012 } 1013 } 1014 1015 if (flags & O_CREAT) 1016 cap_rights_set(rightsp, CAP_CREATE); 1017 1018 if (flags & O_TRUNC) 1019 cap_rights_set(rightsp, CAP_FTRUNCATE); 1020 1021 if (flags & (O_SYNC | O_FSYNC)) 1022 cap_rights_set(rightsp, CAP_FSYNC); 1023 1024 if (flags & (O_EXLOCK | O_SHLOCK)) 1025 cap_rights_set(rightsp, CAP_FLOCK); 1026 } 1027 1028 /* 1029 * Check permissions, allocate an open file structure, and call the device 1030 * open routine if any. 1031 */ 1032 #ifndef _SYS_SYSPROTO_H_ 1033 struct open_args { 1034 char *path; 1035 int flags; 1036 int mode; 1037 }; 1038 #endif 1039 int 1040 sys_open(struct thread *td, struct open_args *uap) 1041 { 1042 1043 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1044 uap->flags, uap->mode)); 1045 } 1046 1047 #ifndef _SYS_SYSPROTO_H_ 1048 struct openat_args { 1049 int fd; 1050 char *path; 1051 int flag; 1052 int mode; 1053 }; 1054 #endif 1055 int 1056 sys_openat(struct thread *td, struct openat_args *uap) 1057 { 1058 1059 AUDIT_ARG_FD(uap->fd); 1060 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1061 uap->mode)); 1062 } 1063 1064 int 1065 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1066 int flags, int mode) 1067 { 1068 struct proc *p = td->td_proc; 1069 struct filedesc *fdp = p->p_fd; 1070 struct file *fp; 1071 struct vnode *vp; 1072 struct nameidata nd; 1073 cap_rights_t rights; 1074 int cmode, error, indx; 1075 1076 indx = -1; 1077 1078 AUDIT_ARG_FFLAGS(flags); 1079 AUDIT_ARG_MODE(mode); 1080 cap_rights_init(&rights, CAP_LOOKUP); 1081 flags_to_rights(flags, &rights); 1082 /* 1083 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1084 * may be specified. 1085 */ 1086 if (flags & O_EXEC) { 1087 if (flags & O_ACCMODE) 1088 return (EINVAL); 1089 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1090 return (EINVAL); 1091 } else { 1092 flags = FFLAGS(flags); 1093 } 1094 1095 /* 1096 * Allocate a file structure. The descriptor to reference it 1097 * is allocated and set by finstall() below. 1098 */ 1099 error = falloc_noinstall(td, &fp); 1100 if (error != 0) 1101 return (error); 1102 /* 1103 * An extra reference on `fp' has been held for us by 1104 * falloc_noinstall(). 1105 */ 1106 /* Set the flags early so the finit in devfs can pick them up. */ 1107 fp->f_flag = flags & FMASK; 1108 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; 1109 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1110 &rights, td); 1111 td->td_dupfd = -1; /* XXX check for fdopen */ 1112 error = vn_open(&nd, &flags, cmode, fp); 1113 if (error != 0) { 1114 /* 1115 * If the vn_open replaced the method vector, something 1116 * wonderous happened deep below and we just pass it up 1117 * pretending we know what we do. 1118 */ 1119 if (error == ENXIO && fp->f_ops != &badfileops) 1120 goto success; 1121 1122 /* 1123 * Handle special fdopen() case. bleh. 1124 * 1125 * Don't do this for relative (capability) lookups; we don't 1126 * understand exactly what would happen, and we don't think 1127 * that it ever should. 1128 */ 1129 if ((nd.ni_resflags & NIRES_STRICTREL) == 0 && 1130 (error == ENODEV || error == ENXIO) && 1131 td->td_dupfd >= 0) { 1132 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1133 &indx); 1134 if (error == 0) 1135 goto success; 1136 } 1137 1138 goto bad; 1139 } 1140 td->td_dupfd = 0; 1141 NDFREE(&nd, NDF_ONLY_PNBUF); 1142 vp = nd.ni_vp; 1143 1144 /* 1145 * Store the vnode, for any f_type. Typically, the vnode use 1146 * count is decremented by direct call to vn_closefile() for 1147 * files that switched type in the cdevsw fdopen() method. 1148 */ 1149 fp->f_vnode = vp; 1150 /* 1151 * If the file wasn't claimed by devfs bind it to the normal 1152 * vnode operations here. 1153 */ 1154 if (fp->f_ops == &badfileops) { 1155 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); 1156 fp->f_seqcount = 1; 1157 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK), 1158 DTYPE_VNODE, vp, &vnops); 1159 } 1160 1161 VOP_UNLOCK(vp, 0); 1162 if (flags & O_TRUNC) { 1163 error = fo_truncate(fp, 0, td->td_ucred, td); 1164 if (error != 0) 1165 goto bad; 1166 } 1167 success: 1168 /* 1169 * If we haven't already installed the FD (for dupfdopen), do so now. 1170 */ 1171 if (indx == -1) { 1172 struct filecaps *fcaps; 1173 1174 #ifdef CAPABILITIES 1175 if ((nd.ni_resflags & NIRES_STRICTREL) != 0) 1176 fcaps = &nd.ni_filecaps; 1177 else 1178 #endif 1179 fcaps = NULL; 1180 error = finstall(td, fp, &indx, flags, fcaps); 1181 /* On success finstall() consumes fcaps. */ 1182 if (error != 0) { 1183 filecaps_free(&nd.ni_filecaps); 1184 goto bad; 1185 } 1186 } else { 1187 filecaps_free(&nd.ni_filecaps); 1188 } 1189 1190 /* 1191 * Release our private reference, leaving the one associated with 1192 * the descriptor table intact. 1193 */ 1194 fdrop(fp, td); 1195 td->td_retval[0] = indx; 1196 return (0); 1197 bad: 1198 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1199 fdrop(fp, td); 1200 return (error); 1201 } 1202 1203 #ifdef COMPAT_43 1204 /* 1205 * Create a file. 1206 */ 1207 #ifndef _SYS_SYSPROTO_H_ 1208 struct ocreat_args { 1209 char *path; 1210 int mode; 1211 }; 1212 #endif 1213 int 1214 ocreat(struct thread *td, struct ocreat_args *uap) 1215 { 1216 1217 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1218 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1219 } 1220 #endif /* COMPAT_43 */ 1221 1222 /* 1223 * Create a special file. 1224 */ 1225 #ifndef _SYS_SYSPROTO_H_ 1226 struct mknodat_args { 1227 int fd; 1228 char *path; 1229 mode_t mode; 1230 dev_t dev; 1231 }; 1232 #endif 1233 int 1234 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1235 { 1236 1237 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1238 uap->dev)); 1239 } 1240 1241 #if defined(COMPAT_FREEBSD11) 1242 int 1243 freebsd11_mknod(struct thread *td, 1244 struct freebsd11_mknod_args *uap) 1245 { 1246 1247 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1248 uap->mode, uap->dev)); 1249 } 1250 1251 int 1252 freebsd11_mknodat(struct thread *td, 1253 struct freebsd11_mknodat_args *uap) 1254 { 1255 1256 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1257 uap->dev)); 1258 } 1259 #endif /* COMPAT_FREEBSD11 */ 1260 1261 int 1262 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1263 int mode, dev_t dev) 1264 { 1265 struct vnode *vp; 1266 struct mount *mp; 1267 struct vattr vattr; 1268 struct nameidata nd; 1269 int error, whiteout = 0; 1270 1271 AUDIT_ARG_MODE(mode); 1272 AUDIT_ARG_DEV(dev); 1273 switch (mode & S_IFMT) { 1274 case S_IFCHR: 1275 case S_IFBLK: 1276 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1277 if (error == 0 && dev == VNOVAL) 1278 error = EINVAL; 1279 break; 1280 case S_IFWHT: 1281 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1282 break; 1283 case S_IFIFO: 1284 if (dev == 0) 1285 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1286 /* FALLTHROUGH */ 1287 default: 1288 error = EINVAL; 1289 break; 1290 } 1291 if (error != 0) 1292 return (error); 1293 restart: 1294 bwillwrite(); 1295 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1296 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1297 td); 1298 if ((error = namei(&nd)) != 0) 1299 return (error); 1300 vp = nd.ni_vp; 1301 if (vp != NULL) { 1302 NDFREE(&nd, NDF_ONLY_PNBUF); 1303 if (vp == nd.ni_dvp) 1304 vrele(nd.ni_dvp); 1305 else 1306 vput(nd.ni_dvp); 1307 vrele(vp); 1308 return (EEXIST); 1309 } else { 1310 VATTR_NULL(&vattr); 1311 vattr.va_mode = (mode & ALLPERMS) & 1312 ~td->td_proc->p_fd->fd_cmask; 1313 vattr.va_rdev = dev; 1314 whiteout = 0; 1315 1316 switch (mode & S_IFMT) { 1317 case S_IFCHR: 1318 vattr.va_type = VCHR; 1319 break; 1320 case S_IFBLK: 1321 vattr.va_type = VBLK; 1322 break; 1323 case S_IFWHT: 1324 whiteout = 1; 1325 break; 1326 default: 1327 panic("kern_mknod: invalid mode"); 1328 } 1329 } 1330 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1331 NDFREE(&nd, NDF_ONLY_PNBUF); 1332 vput(nd.ni_dvp); 1333 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1334 return (error); 1335 goto restart; 1336 } 1337 #ifdef MAC 1338 if (error == 0 && !whiteout) 1339 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1340 &nd.ni_cnd, &vattr); 1341 #endif 1342 if (error == 0) { 1343 if (whiteout) 1344 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1345 else { 1346 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1347 &nd.ni_cnd, &vattr); 1348 if (error == 0) 1349 vput(nd.ni_vp); 1350 } 1351 } 1352 NDFREE(&nd, NDF_ONLY_PNBUF); 1353 vput(nd.ni_dvp); 1354 vn_finished_write(mp); 1355 return (error); 1356 } 1357 1358 /* 1359 * Create a named pipe. 1360 */ 1361 #ifndef _SYS_SYSPROTO_H_ 1362 struct mkfifo_args { 1363 char *path; 1364 int mode; 1365 }; 1366 #endif 1367 int 1368 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1369 { 1370 1371 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1372 uap->mode)); 1373 } 1374 1375 #ifndef _SYS_SYSPROTO_H_ 1376 struct mkfifoat_args { 1377 int fd; 1378 char *path; 1379 mode_t mode; 1380 }; 1381 #endif 1382 int 1383 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1384 { 1385 1386 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1387 uap->mode)); 1388 } 1389 1390 int 1391 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1392 int mode) 1393 { 1394 struct mount *mp; 1395 struct vattr vattr; 1396 struct nameidata nd; 1397 int error; 1398 1399 AUDIT_ARG_MODE(mode); 1400 restart: 1401 bwillwrite(); 1402 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1403 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1404 td); 1405 if ((error = namei(&nd)) != 0) 1406 return (error); 1407 if (nd.ni_vp != NULL) { 1408 NDFREE(&nd, NDF_ONLY_PNBUF); 1409 if (nd.ni_vp == nd.ni_dvp) 1410 vrele(nd.ni_dvp); 1411 else 1412 vput(nd.ni_dvp); 1413 vrele(nd.ni_vp); 1414 return (EEXIST); 1415 } 1416 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1417 NDFREE(&nd, NDF_ONLY_PNBUF); 1418 vput(nd.ni_dvp); 1419 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1420 return (error); 1421 goto restart; 1422 } 1423 VATTR_NULL(&vattr); 1424 vattr.va_type = VFIFO; 1425 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1426 #ifdef MAC 1427 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1428 &vattr); 1429 if (error != 0) 1430 goto out; 1431 #endif 1432 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1433 if (error == 0) 1434 vput(nd.ni_vp); 1435 #ifdef MAC 1436 out: 1437 #endif 1438 vput(nd.ni_dvp); 1439 vn_finished_write(mp); 1440 NDFREE(&nd, NDF_ONLY_PNBUF); 1441 return (error); 1442 } 1443 1444 /* 1445 * Make a hard file link. 1446 */ 1447 #ifndef _SYS_SYSPROTO_H_ 1448 struct link_args { 1449 char *path; 1450 char *link; 1451 }; 1452 #endif 1453 int 1454 sys_link(struct thread *td, struct link_args *uap) 1455 { 1456 1457 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1458 UIO_USERSPACE, FOLLOW)); 1459 } 1460 1461 #ifndef _SYS_SYSPROTO_H_ 1462 struct linkat_args { 1463 int fd1; 1464 char *path1; 1465 int fd2; 1466 char *path2; 1467 int flag; 1468 }; 1469 #endif 1470 int 1471 sys_linkat(struct thread *td, struct linkat_args *uap) 1472 { 1473 int flag; 1474 1475 flag = uap->flag; 1476 if ((flag & ~(AT_SYMLINK_FOLLOW | AT_RESOLVE_BENEATH)) != 0) 1477 return (EINVAL); 1478 1479 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1480 UIO_USERSPACE, at2cnpflags(flag, AT_SYMLINK_FOLLOW | 1481 AT_RESOLVE_BENEATH))); 1482 } 1483 1484 int hardlink_check_uid = 0; 1485 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1486 &hardlink_check_uid, 0, 1487 "Unprivileged processes cannot create hard links to files owned by other " 1488 "users"); 1489 static int hardlink_check_gid = 0; 1490 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1491 &hardlink_check_gid, 0, 1492 "Unprivileged processes cannot create hard links to files owned by other " 1493 "groups"); 1494 1495 static int 1496 can_hardlink(struct vnode *vp, struct ucred *cred) 1497 { 1498 struct vattr va; 1499 int error; 1500 1501 if (!hardlink_check_uid && !hardlink_check_gid) 1502 return (0); 1503 1504 error = VOP_GETATTR(vp, &va, cred); 1505 if (error != 0) 1506 return (error); 1507 1508 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1509 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1510 if (error != 0) 1511 return (error); 1512 } 1513 1514 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1515 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1516 if (error != 0) 1517 return (error); 1518 } 1519 1520 return (0); 1521 } 1522 1523 int 1524 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2, 1525 enum uio_seg segflag, int follow) 1526 { 1527 struct nameidata nd; 1528 int error; 1529 1530 do { 1531 bwillwrite(); 1532 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag, 1533 path1, fd1, &cap_linkat_source_rights, td); 1534 if ((error = namei(&nd)) != 0) 1535 return (error); 1536 NDFREE(&nd, NDF_ONLY_PNBUF); 1537 error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); 1538 } while (error == EAGAIN); 1539 return (error); 1540 } 1541 1542 static int 1543 kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, 1544 enum uio_seg segflag) 1545 { 1546 struct nameidata nd; 1547 struct mount *mp; 1548 int error; 1549 1550 if (vp->v_type == VDIR) { 1551 vrele(vp); 1552 return (EPERM); /* POSIX */ 1553 } 1554 NDINIT_ATRIGHTS(&nd, CREATE, 1555 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, 1556 &cap_linkat_target_rights, td); 1557 if ((error = namei(&nd)) == 0) { 1558 if (nd.ni_vp != NULL) { 1559 NDFREE(&nd, NDF_ONLY_PNBUF); 1560 if (nd.ni_dvp == nd.ni_vp) 1561 vrele(nd.ni_dvp); 1562 else 1563 vput(nd.ni_dvp); 1564 vrele(nd.ni_vp); 1565 vrele(vp); 1566 return (EEXIST); 1567 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1568 /* 1569 * Cross-device link. No need to recheck 1570 * vp->v_type, since it cannot change, except 1571 * to VBAD. 1572 */ 1573 NDFREE(&nd, NDF_ONLY_PNBUF); 1574 vput(nd.ni_dvp); 1575 vrele(vp); 1576 return (EXDEV); 1577 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1578 error = can_hardlink(vp, td->td_ucred); 1579 #ifdef MAC 1580 if (error == 0) 1581 error = mac_vnode_check_link(td->td_ucred, 1582 nd.ni_dvp, vp, &nd.ni_cnd); 1583 #endif 1584 if (error != 0) { 1585 vput(vp); 1586 vput(nd.ni_dvp); 1587 NDFREE(&nd, NDF_ONLY_PNBUF); 1588 return (error); 1589 } 1590 error = vn_start_write(vp, &mp, V_NOWAIT); 1591 if (error != 0) { 1592 vput(vp); 1593 vput(nd.ni_dvp); 1594 NDFREE(&nd, NDF_ONLY_PNBUF); 1595 error = vn_start_write(NULL, &mp, 1596 V_XSLEEP | PCATCH); 1597 if (error != 0) 1598 return (error); 1599 return (EAGAIN); 1600 } 1601 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1602 VOP_UNLOCK(vp, 0); 1603 vput(nd.ni_dvp); 1604 vn_finished_write(mp); 1605 NDFREE(&nd, NDF_ONLY_PNBUF); 1606 } else { 1607 vput(nd.ni_dvp); 1608 NDFREE(&nd, NDF_ONLY_PNBUF); 1609 vrele(vp); 1610 return (EAGAIN); 1611 } 1612 } 1613 vrele(vp); 1614 return (error); 1615 } 1616 1617 /* 1618 * Make a symbolic link. 1619 */ 1620 #ifndef _SYS_SYSPROTO_H_ 1621 struct symlink_args { 1622 char *path; 1623 char *link; 1624 }; 1625 #endif 1626 int 1627 sys_symlink(struct thread *td, struct symlink_args *uap) 1628 { 1629 1630 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1631 UIO_USERSPACE)); 1632 } 1633 1634 #ifndef _SYS_SYSPROTO_H_ 1635 struct symlinkat_args { 1636 char *path; 1637 int fd; 1638 char *path2; 1639 }; 1640 #endif 1641 int 1642 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1643 { 1644 1645 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1646 UIO_USERSPACE)); 1647 } 1648 1649 int 1650 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2, 1651 enum uio_seg segflg) 1652 { 1653 struct mount *mp; 1654 struct vattr vattr; 1655 char *syspath; 1656 struct nameidata nd; 1657 int error; 1658 1659 if (segflg == UIO_SYSSPACE) { 1660 syspath = path1; 1661 } else { 1662 syspath = uma_zalloc(namei_zone, M_WAITOK); 1663 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0) 1664 goto out; 1665 } 1666 AUDIT_ARG_TEXT(syspath); 1667 restart: 1668 bwillwrite(); 1669 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1670 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1671 td); 1672 if ((error = namei(&nd)) != 0) 1673 goto out; 1674 if (nd.ni_vp) { 1675 NDFREE(&nd, NDF_ONLY_PNBUF); 1676 if (nd.ni_vp == nd.ni_dvp) 1677 vrele(nd.ni_dvp); 1678 else 1679 vput(nd.ni_dvp); 1680 vrele(nd.ni_vp); 1681 error = EEXIST; 1682 goto out; 1683 } 1684 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1685 NDFREE(&nd, NDF_ONLY_PNBUF); 1686 vput(nd.ni_dvp); 1687 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1688 goto out; 1689 goto restart; 1690 } 1691 VATTR_NULL(&vattr); 1692 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1693 #ifdef MAC 1694 vattr.va_type = VLNK; 1695 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1696 &vattr); 1697 if (error != 0) 1698 goto out2; 1699 #endif 1700 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1701 if (error == 0) 1702 vput(nd.ni_vp); 1703 #ifdef MAC 1704 out2: 1705 #endif 1706 NDFREE(&nd, NDF_ONLY_PNBUF); 1707 vput(nd.ni_dvp); 1708 vn_finished_write(mp); 1709 out: 1710 if (segflg != UIO_SYSSPACE) 1711 uma_zfree(namei_zone, syspath); 1712 return (error); 1713 } 1714 1715 /* 1716 * Delete a whiteout from the filesystem. 1717 */ 1718 #ifndef _SYS_SYSPROTO_H_ 1719 struct undelete_args { 1720 char *path; 1721 }; 1722 #endif 1723 int 1724 sys_undelete(struct thread *td, struct undelete_args *uap) 1725 { 1726 struct mount *mp; 1727 struct nameidata nd; 1728 int error; 1729 1730 restart: 1731 bwillwrite(); 1732 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1733 UIO_USERSPACE, uap->path, td); 1734 error = namei(&nd); 1735 if (error != 0) 1736 return (error); 1737 1738 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1739 NDFREE(&nd, NDF_ONLY_PNBUF); 1740 if (nd.ni_vp == nd.ni_dvp) 1741 vrele(nd.ni_dvp); 1742 else 1743 vput(nd.ni_dvp); 1744 if (nd.ni_vp) 1745 vrele(nd.ni_vp); 1746 return (EEXIST); 1747 } 1748 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1749 NDFREE(&nd, NDF_ONLY_PNBUF); 1750 vput(nd.ni_dvp); 1751 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1752 return (error); 1753 goto restart; 1754 } 1755 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1756 NDFREE(&nd, NDF_ONLY_PNBUF); 1757 vput(nd.ni_dvp); 1758 vn_finished_write(mp); 1759 return (error); 1760 } 1761 1762 /* 1763 * Delete a name from the filesystem. 1764 */ 1765 #ifndef _SYS_SYSPROTO_H_ 1766 struct unlink_args { 1767 char *path; 1768 }; 1769 #endif 1770 int 1771 sys_unlink(struct thread *td, struct unlink_args *uap) 1772 { 1773 1774 return (kern_unlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0, 0)); 1775 } 1776 1777 #ifndef _SYS_SYSPROTO_H_ 1778 struct unlinkat_args { 1779 int fd; 1780 char *path; 1781 int flag; 1782 }; 1783 #endif 1784 int 1785 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1786 { 1787 int fd, flag; 1788 char *path; 1789 1790 flag = uap->flag; 1791 fd = uap->fd; 1792 path = uap->path; 1793 1794 if ((flag & ~(AT_REMOVEDIR | AT_RESOLVE_BENEATH)) != 0) 1795 return (EINVAL); 1796 1797 if ((uap->flag & AT_REMOVEDIR) != 0) 1798 return (kern_rmdirat(td, fd, path, UIO_USERSPACE, flag)); 1799 else 1800 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, flag, 0)); 1801 } 1802 1803 int 1804 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1805 int flag, ino_t oldinum) 1806 { 1807 struct mount *mp; 1808 struct vnode *vp; 1809 struct nameidata nd; 1810 struct stat sb; 1811 int error; 1812 1813 restart: 1814 bwillwrite(); 1815 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 1816 at2cnpflags(flag, AT_RESOLVE_BENEATH), 1817 pathseg, path, fd, &cap_unlinkat_rights, td); 1818 if ((error = namei(&nd)) != 0) 1819 return (error == EINVAL ? EPERM : error); 1820 vp = nd.ni_vp; 1821 if (vp->v_type == VDIR && oldinum == 0) { 1822 error = EPERM; /* POSIX */ 1823 } else if (oldinum != 0 && 1824 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1825 sb.st_ino != oldinum) { 1826 error = EIDRM; /* Identifier removed */ 1827 } else { 1828 /* 1829 * The root of a mounted filesystem cannot be deleted. 1830 * 1831 * XXX: can this only be a VDIR case? 1832 */ 1833 if (vp->v_vflag & VV_ROOT) 1834 error = EBUSY; 1835 } 1836 if (error == 0) { 1837 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1838 NDFREE(&nd, NDF_ONLY_PNBUF); 1839 vput(nd.ni_dvp); 1840 if (vp == nd.ni_dvp) 1841 vrele(vp); 1842 else 1843 vput(vp); 1844 if ((error = vn_start_write(NULL, &mp, 1845 V_XSLEEP | PCATCH)) != 0) 1846 return (error); 1847 goto restart; 1848 } 1849 #ifdef MAC 1850 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1851 &nd.ni_cnd); 1852 if (error != 0) 1853 goto out; 1854 #endif 1855 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1856 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1857 #ifdef MAC 1858 out: 1859 #endif 1860 vn_finished_write(mp); 1861 } 1862 NDFREE(&nd, NDF_ONLY_PNBUF); 1863 vput(nd.ni_dvp); 1864 if (vp == nd.ni_dvp) 1865 vrele(vp); 1866 else 1867 vput(vp); 1868 return (error); 1869 } 1870 1871 /* 1872 * Reposition read/write file offset. 1873 */ 1874 #ifndef _SYS_SYSPROTO_H_ 1875 struct lseek_args { 1876 int fd; 1877 int pad; 1878 off_t offset; 1879 int whence; 1880 }; 1881 #endif 1882 int 1883 sys_lseek(struct thread *td, struct lseek_args *uap) 1884 { 1885 1886 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1887 } 1888 1889 int 1890 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1891 { 1892 struct file *fp; 1893 int error; 1894 1895 AUDIT_ARG_FD(fd); 1896 error = fget(td, fd, &cap_seek_rights, &fp); 1897 if (error != 0) 1898 return (error); 1899 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1900 fo_seek(fp, offset, whence, td) : ESPIPE; 1901 fdrop(fp, td); 1902 return (error); 1903 } 1904 1905 #if defined(COMPAT_43) 1906 /* 1907 * Reposition read/write file offset. 1908 */ 1909 #ifndef _SYS_SYSPROTO_H_ 1910 struct olseek_args { 1911 int fd; 1912 long offset; 1913 int whence; 1914 }; 1915 #endif 1916 int 1917 olseek(struct thread *td, struct olseek_args *uap) 1918 { 1919 1920 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1921 } 1922 #endif /* COMPAT_43 */ 1923 1924 #if defined(COMPAT_FREEBSD6) 1925 /* Version with the 'pad' argument */ 1926 int 1927 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 1928 { 1929 1930 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1931 } 1932 #endif 1933 1934 /* 1935 * Check access permissions using passed credentials. 1936 */ 1937 static int 1938 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 1939 struct thread *td) 1940 { 1941 accmode_t accmode; 1942 int error; 1943 1944 /* Flags == 0 means only check for existence. */ 1945 if (user_flags == 0) 1946 return (0); 1947 1948 accmode = 0; 1949 if (user_flags & R_OK) 1950 accmode |= VREAD; 1951 if (user_flags & W_OK) 1952 accmode |= VWRITE; 1953 if (user_flags & X_OK) 1954 accmode |= VEXEC; 1955 #ifdef MAC 1956 error = mac_vnode_check_access(cred, vp, accmode); 1957 if (error != 0) 1958 return (error); 1959 #endif 1960 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1961 error = VOP_ACCESS(vp, accmode, cred, td); 1962 return (error); 1963 } 1964 1965 /* 1966 * Check access permissions using "real" credentials. 1967 */ 1968 #ifndef _SYS_SYSPROTO_H_ 1969 struct access_args { 1970 char *path; 1971 int amode; 1972 }; 1973 #endif 1974 int 1975 sys_access(struct thread *td, struct access_args *uap) 1976 { 1977 1978 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1979 0, uap->amode)); 1980 } 1981 1982 #ifndef _SYS_SYSPROTO_H_ 1983 struct faccessat_args { 1984 int dirfd; 1985 char *path; 1986 int amode; 1987 int flag; 1988 } 1989 #endif 1990 int 1991 sys_faccessat(struct thread *td, struct faccessat_args *uap) 1992 { 1993 1994 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1995 uap->amode)); 1996 } 1997 1998 int 1999 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2000 int flag, int amode) 2001 { 2002 struct ucred *cred, *usecred; 2003 struct vnode *vp; 2004 struct nameidata nd; 2005 int error; 2006 2007 if ((flag & ~(AT_EACCESS | AT_RESOLVE_BENEATH)) != 0) 2008 return (EINVAL); 2009 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 2010 return (EINVAL); 2011 2012 /* 2013 * Create and modify a temporary credential instead of one that 2014 * is potentially shared (if we need one). 2015 */ 2016 cred = td->td_ucred; 2017 if ((flag & AT_EACCESS) == 0 && 2018 ((cred->cr_uid != cred->cr_ruid || 2019 cred->cr_rgid != cred->cr_groups[0]))) { 2020 usecred = crdup(cred); 2021 usecred->cr_uid = cred->cr_ruid; 2022 usecred->cr_groups[0] = cred->cr_rgid; 2023 td->td_ucred = usecred; 2024 } else 2025 usecred = cred; 2026 AUDIT_ARG_VALUE(amode); 2027 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 2028 AUDITVNODE1 | at2cnpflags(flag, AT_RESOLVE_BENEATH), 2029 pathseg, path, fd, &cap_fstat_rights, td); 2030 if ((error = namei(&nd)) != 0) 2031 goto out; 2032 vp = nd.ni_vp; 2033 2034 error = vn_access(vp, amode, usecred, td); 2035 NDFREE(&nd, NDF_ONLY_PNBUF); 2036 vput(vp); 2037 out: 2038 if (usecred != cred) { 2039 td->td_ucred = cred; 2040 crfree(usecred); 2041 } 2042 return (error); 2043 } 2044 2045 /* 2046 * Check access permissions using "effective" credentials. 2047 */ 2048 #ifndef _SYS_SYSPROTO_H_ 2049 struct eaccess_args { 2050 char *path; 2051 int amode; 2052 }; 2053 #endif 2054 int 2055 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2056 { 2057 2058 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2059 AT_EACCESS, uap->amode)); 2060 } 2061 2062 #if defined(COMPAT_43) 2063 /* 2064 * Get file status; this version follows links. 2065 */ 2066 #ifndef _SYS_SYSPROTO_H_ 2067 struct ostat_args { 2068 char *path; 2069 struct ostat *ub; 2070 }; 2071 #endif 2072 int 2073 ostat(struct thread *td, struct ostat_args *uap) 2074 { 2075 struct stat sb; 2076 struct ostat osb; 2077 int error; 2078 2079 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2080 &sb, NULL); 2081 if (error != 0) 2082 return (error); 2083 cvtstat(&sb, &osb); 2084 return (copyout(&osb, uap->ub, sizeof (osb))); 2085 } 2086 2087 /* 2088 * Get file status; this version does not follow links. 2089 */ 2090 #ifndef _SYS_SYSPROTO_H_ 2091 struct olstat_args { 2092 char *path; 2093 struct ostat *ub; 2094 }; 2095 #endif 2096 int 2097 olstat(struct thread *td, struct olstat_args *uap) 2098 { 2099 struct stat sb; 2100 struct ostat osb; 2101 int error; 2102 2103 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2104 UIO_USERSPACE, &sb, NULL); 2105 if (error != 0) 2106 return (error); 2107 cvtstat(&sb, &osb); 2108 return (copyout(&osb, uap->ub, sizeof (osb))); 2109 } 2110 2111 /* 2112 * Convert from an old to a new stat structure. 2113 * XXX: many values are blindly truncated. 2114 */ 2115 void 2116 cvtstat(struct stat *st, struct ostat *ost) 2117 { 2118 2119 bzero(ost, sizeof(*ost)); 2120 ost->st_dev = st->st_dev; 2121 ost->st_ino = st->st_ino; 2122 ost->st_mode = st->st_mode; 2123 ost->st_nlink = st->st_nlink; 2124 ost->st_uid = st->st_uid; 2125 ost->st_gid = st->st_gid; 2126 ost->st_rdev = st->st_rdev; 2127 ost->st_size = MIN(st->st_size, INT32_MAX); 2128 ost->st_atim = st->st_atim; 2129 ost->st_mtim = st->st_mtim; 2130 ost->st_ctim = st->st_ctim; 2131 ost->st_blksize = st->st_blksize; 2132 ost->st_blocks = st->st_blocks; 2133 ost->st_flags = st->st_flags; 2134 ost->st_gen = st->st_gen; 2135 } 2136 #endif /* COMPAT_43 */ 2137 2138 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2139 int ino64_trunc_error; 2140 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2141 &ino64_trunc_error, 0, 2142 "Error on truncation of device, file or inode number, or link count"); 2143 2144 int 2145 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2146 { 2147 2148 ost->st_dev = st->st_dev; 2149 if (ost->st_dev != st->st_dev) { 2150 switch (ino64_trunc_error) { 2151 default: 2152 /* 2153 * Since dev_t is almost raw, don't clamp to the 2154 * maximum for case 2, but ignore the error. 2155 */ 2156 break; 2157 case 1: 2158 return (EOVERFLOW); 2159 } 2160 } 2161 ost->st_ino = st->st_ino; 2162 if (ost->st_ino != st->st_ino) { 2163 switch (ino64_trunc_error) { 2164 default: 2165 case 0: 2166 break; 2167 case 1: 2168 return (EOVERFLOW); 2169 case 2: 2170 ost->st_ino = UINT32_MAX; 2171 break; 2172 } 2173 } 2174 ost->st_mode = st->st_mode; 2175 ost->st_nlink = st->st_nlink; 2176 if (ost->st_nlink != st->st_nlink) { 2177 switch (ino64_trunc_error) { 2178 default: 2179 case 0: 2180 break; 2181 case 1: 2182 return (EOVERFLOW); 2183 case 2: 2184 ost->st_nlink = UINT16_MAX; 2185 break; 2186 } 2187 } 2188 ost->st_uid = st->st_uid; 2189 ost->st_gid = st->st_gid; 2190 ost->st_rdev = st->st_rdev; 2191 if (ost->st_rdev != st->st_rdev) { 2192 switch (ino64_trunc_error) { 2193 default: 2194 break; 2195 case 1: 2196 return (EOVERFLOW); 2197 } 2198 } 2199 ost->st_atim = st->st_atim; 2200 ost->st_mtim = st->st_mtim; 2201 ost->st_ctim = st->st_ctim; 2202 ost->st_size = st->st_size; 2203 ost->st_blocks = st->st_blocks; 2204 ost->st_blksize = st->st_blksize; 2205 ost->st_flags = st->st_flags; 2206 ost->st_gen = st->st_gen; 2207 ost->st_lspare = 0; 2208 ost->st_birthtim = st->st_birthtim; 2209 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2210 sizeof(*ost) - offsetof(struct freebsd11_stat, 2211 st_birthtim) - sizeof(ost->st_birthtim)); 2212 return (0); 2213 } 2214 2215 int 2216 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2217 { 2218 struct stat sb; 2219 struct freebsd11_stat osb; 2220 int error; 2221 2222 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2223 &sb, NULL); 2224 if (error != 0) 2225 return (error); 2226 error = freebsd11_cvtstat(&sb, &osb); 2227 if (error == 0) 2228 error = copyout(&osb, uap->ub, sizeof(osb)); 2229 return (error); 2230 } 2231 2232 int 2233 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2234 { 2235 struct stat sb; 2236 struct freebsd11_stat osb; 2237 int error; 2238 2239 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2240 UIO_USERSPACE, &sb, NULL); 2241 if (error != 0) 2242 return (error); 2243 error = freebsd11_cvtstat(&sb, &osb); 2244 if (error == 0) 2245 error = copyout(&osb, uap->ub, sizeof(osb)); 2246 return (error); 2247 } 2248 2249 int 2250 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2251 { 2252 struct fhandle fh; 2253 struct stat sb; 2254 struct freebsd11_stat osb; 2255 int error; 2256 2257 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2258 if (error != 0) 2259 return (error); 2260 error = kern_fhstat(td, fh, &sb); 2261 if (error != 0) 2262 return (error); 2263 error = freebsd11_cvtstat(&sb, &osb); 2264 if (error == 0) 2265 error = copyout(&osb, uap->sb, sizeof(osb)); 2266 return (error); 2267 } 2268 2269 int 2270 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2271 { 2272 struct stat sb; 2273 struct freebsd11_stat osb; 2274 int error; 2275 2276 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2277 UIO_USERSPACE, &sb, NULL); 2278 if (error != 0) 2279 return (error); 2280 error = freebsd11_cvtstat(&sb, &osb); 2281 if (error == 0) 2282 error = copyout(&osb, uap->buf, sizeof(osb)); 2283 return (error); 2284 } 2285 #endif /* COMPAT_FREEBSD11 */ 2286 2287 /* 2288 * Get file status 2289 */ 2290 #ifndef _SYS_SYSPROTO_H_ 2291 struct fstatat_args { 2292 int fd; 2293 char *path; 2294 struct stat *buf; 2295 int flag; 2296 } 2297 #endif 2298 int 2299 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2300 { 2301 struct stat sb; 2302 int error; 2303 2304 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2305 UIO_USERSPACE, &sb, NULL); 2306 if (error == 0) 2307 error = copyout(&sb, uap->buf, sizeof (sb)); 2308 return (error); 2309 } 2310 2311 int 2312 kern_statat(struct thread *td, int flag, int fd, char *path, 2313 enum uio_seg pathseg, struct stat *sbp, 2314 void (*hook)(struct vnode *vp, struct stat *sbp)) 2315 { 2316 struct nameidata nd; 2317 struct stat sb; 2318 int error; 2319 2320 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 2321 return (EINVAL); 2322 2323 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_RESOLVE_BENEATH | 2324 AT_SYMLINK_NOFOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2325 pathseg, path, fd, &cap_fstat_rights, td); 2326 2327 if ((error = namei(&nd)) != 0) 2328 return (error); 2329 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 2330 if (error == 0) { 2331 SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode); 2332 if (S_ISREG(sb.st_mode)) 2333 SDT_PROBE2(vfs, , stat, reg, path, pathseg); 2334 if (__predict_false(hook != NULL)) 2335 hook(nd.ni_vp, &sb); 2336 } 2337 NDFREE(&nd, NDF_ONLY_PNBUF); 2338 vput(nd.ni_vp); 2339 if (error != 0) 2340 return (error); 2341 #ifdef __STAT_TIME_T_EXT 2342 sb.st_atim_ext = 0; 2343 sb.st_mtim_ext = 0; 2344 sb.st_ctim_ext = 0; 2345 sb.st_btim_ext = 0; 2346 #endif 2347 *sbp = sb; 2348 #ifdef KTRACE 2349 if (KTRPOINT(td, KTR_STRUCT)) 2350 ktrstat(&sb); 2351 #endif 2352 return (0); 2353 } 2354 2355 #if defined(COMPAT_FREEBSD11) 2356 /* 2357 * Implementation of the NetBSD [l]stat() functions. 2358 */ 2359 void 2360 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2361 { 2362 2363 bzero(nsb, sizeof(*nsb)); 2364 nsb->st_dev = sb->st_dev; 2365 nsb->st_ino = sb->st_ino; 2366 nsb->st_mode = sb->st_mode; 2367 nsb->st_nlink = sb->st_nlink; 2368 nsb->st_uid = sb->st_uid; 2369 nsb->st_gid = sb->st_gid; 2370 nsb->st_rdev = sb->st_rdev; 2371 nsb->st_atim = sb->st_atim; 2372 nsb->st_mtim = sb->st_mtim; 2373 nsb->st_ctim = sb->st_ctim; 2374 nsb->st_size = sb->st_size; 2375 nsb->st_blocks = sb->st_blocks; 2376 nsb->st_blksize = sb->st_blksize; 2377 nsb->st_flags = sb->st_flags; 2378 nsb->st_gen = sb->st_gen; 2379 nsb->st_birthtim = sb->st_birthtim; 2380 } 2381 2382 #ifndef _SYS_SYSPROTO_H_ 2383 struct freebsd11_nstat_args { 2384 char *path; 2385 struct nstat *ub; 2386 }; 2387 #endif 2388 int 2389 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2390 { 2391 struct stat sb; 2392 struct nstat nsb; 2393 int error; 2394 2395 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2396 &sb, NULL); 2397 if (error != 0) 2398 return (error); 2399 freebsd11_cvtnstat(&sb, &nsb); 2400 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2401 } 2402 2403 /* 2404 * NetBSD lstat. Get file status; this version does not follow links. 2405 */ 2406 #ifndef _SYS_SYSPROTO_H_ 2407 struct freebsd11_nlstat_args { 2408 char *path; 2409 struct nstat *ub; 2410 }; 2411 #endif 2412 int 2413 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2414 { 2415 struct stat sb; 2416 struct nstat nsb; 2417 int error; 2418 2419 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2420 UIO_USERSPACE, &sb, NULL); 2421 if (error != 0) 2422 return (error); 2423 freebsd11_cvtnstat(&sb, &nsb); 2424 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2425 } 2426 #endif /* COMPAT_FREEBSD11 */ 2427 2428 /* 2429 * Get configurable pathname variables. 2430 */ 2431 #ifndef _SYS_SYSPROTO_H_ 2432 struct pathconf_args { 2433 char *path; 2434 int name; 2435 }; 2436 #endif 2437 int 2438 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2439 { 2440 long value; 2441 int error; 2442 2443 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2444 &value); 2445 if (error == 0) 2446 td->td_retval[0] = value; 2447 return (error); 2448 } 2449 2450 #ifndef _SYS_SYSPROTO_H_ 2451 struct lpathconf_args { 2452 char *path; 2453 int name; 2454 }; 2455 #endif 2456 int 2457 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2458 { 2459 long value; 2460 int error; 2461 2462 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2463 NOFOLLOW, &value); 2464 if (error == 0) 2465 td->td_retval[0] = value; 2466 return (error); 2467 } 2468 2469 int 2470 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name, 2471 u_long flags, long *valuep) 2472 { 2473 struct nameidata nd; 2474 int error; 2475 2476 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2477 pathseg, path, td); 2478 if ((error = namei(&nd)) != 0) 2479 return (error); 2480 NDFREE(&nd, NDF_ONLY_PNBUF); 2481 2482 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2483 vput(nd.ni_vp); 2484 return (error); 2485 } 2486 2487 /* 2488 * Return target name of a symbolic link. 2489 */ 2490 #ifndef _SYS_SYSPROTO_H_ 2491 struct readlink_args { 2492 char *path; 2493 char *buf; 2494 size_t count; 2495 }; 2496 #endif 2497 int 2498 sys_readlink(struct thread *td, struct readlink_args *uap) 2499 { 2500 2501 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2502 uap->buf, UIO_USERSPACE, uap->count)); 2503 } 2504 #ifndef _SYS_SYSPROTO_H_ 2505 struct readlinkat_args { 2506 int fd; 2507 char *path; 2508 char *buf; 2509 size_t bufsize; 2510 }; 2511 #endif 2512 int 2513 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2514 { 2515 2516 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2517 uap->buf, UIO_USERSPACE, uap->bufsize)); 2518 } 2519 2520 int 2521 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2522 char *buf, enum uio_seg bufseg, size_t count) 2523 { 2524 struct vnode *vp; 2525 struct nameidata nd; 2526 int error; 2527 2528 if (count > IOSIZE_MAX) 2529 return (EINVAL); 2530 2531 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2532 pathseg, path, fd, td); 2533 2534 if ((error = namei(&nd)) != 0) 2535 return (error); 2536 NDFREE(&nd, NDF_ONLY_PNBUF); 2537 vp = nd.ni_vp; 2538 2539 error = kern_readlink_vp(vp, buf, bufseg, count, td); 2540 vput(vp); 2541 2542 return (error); 2543 } 2544 2545 /* 2546 * Helper function to readlink from a vnode 2547 */ 2548 static int 2549 kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, 2550 struct thread *td) 2551 { 2552 struct iovec aiov; 2553 struct uio auio; 2554 int error; 2555 2556 ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); 2557 #ifdef MAC 2558 error = mac_vnode_check_readlink(td->td_ucred, vp); 2559 if (error != 0) 2560 return (error); 2561 #endif 2562 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2563 return (EINVAL); 2564 2565 aiov.iov_base = buf; 2566 aiov.iov_len = count; 2567 auio.uio_iov = &aiov; 2568 auio.uio_iovcnt = 1; 2569 auio.uio_offset = 0; 2570 auio.uio_rw = UIO_READ; 2571 auio.uio_segflg = bufseg; 2572 auio.uio_td = td; 2573 auio.uio_resid = count; 2574 error = VOP_READLINK(vp, &auio, td->td_ucred); 2575 td->td_retval[0] = count - auio.uio_resid; 2576 return (error); 2577 } 2578 2579 /* 2580 * Common implementation code for chflags() and fchflags(). 2581 */ 2582 static int 2583 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2584 { 2585 struct mount *mp; 2586 struct vattr vattr; 2587 int error; 2588 2589 /* We can't support the value matching VNOVAL. */ 2590 if (flags == VNOVAL) 2591 return (EOPNOTSUPP); 2592 2593 /* 2594 * Prevent non-root users from setting flags on devices. When 2595 * a device is reused, users can retain ownership of the device 2596 * if they are allowed to set flags and programs assume that 2597 * chown can't fail when done as root. 2598 */ 2599 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2600 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2601 if (error != 0) 2602 return (error); 2603 } 2604 2605 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2606 return (error); 2607 VATTR_NULL(&vattr); 2608 vattr.va_flags = flags; 2609 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2610 #ifdef MAC 2611 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2612 if (error == 0) 2613 #endif 2614 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2615 VOP_UNLOCK(vp, 0); 2616 vn_finished_write(mp); 2617 return (error); 2618 } 2619 2620 /* 2621 * Change flags of a file given a path name. 2622 */ 2623 #ifndef _SYS_SYSPROTO_H_ 2624 struct chflags_args { 2625 const char *path; 2626 u_long flags; 2627 }; 2628 #endif 2629 int 2630 sys_chflags(struct thread *td, struct chflags_args *uap) 2631 { 2632 2633 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2634 uap->flags, 0)); 2635 } 2636 2637 #ifndef _SYS_SYSPROTO_H_ 2638 struct chflagsat_args { 2639 int fd; 2640 const char *path; 2641 u_long flags; 2642 int atflag; 2643 } 2644 #endif 2645 int 2646 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2647 { 2648 2649 if ((uap->atflag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 2650 return (EINVAL); 2651 2652 return (kern_chflagsat(td, uap->fd, uap->path, UIO_USERSPACE, 2653 uap->flags, uap->atflag)); 2654 } 2655 2656 /* 2657 * Same as chflags() but doesn't follow symlinks. 2658 */ 2659 #ifndef _SYS_SYSPROTO_H_ 2660 struct lchflags_args { 2661 const char *path; 2662 u_long flags; 2663 }; 2664 #endif 2665 int 2666 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2667 { 2668 2669 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2670 uap->flags, AT_SYMLINK_NOFOLLOW)); 2671 } 2672 2673 static int 2674 kern_chflagsat(struct thread *td, int fd, const char *path, 2675 enum uio_seg pathseg, u_long flags, int atflag) 2676 { 2677 struct nameidata nd; 2678 int error; 2679 2680 AUDIT_ARG_FFLAGS(flags); 2681 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(atflag, AT_SYMLINK_NOFOLLOW | 2682 AT_RESOLVE_BENEATH) | AUDITVNODE1, pathseg, path, fd, 2683 &cap_fchflags_rights, td); 2684 if ((error = namei(&nd)) != 0) 2685 return (error); 2686 NDFREE(&nd, NDF_ONLY_PNBUF); 2687 error = setfflags(td, nd.ni_vp, flags); 2688 vrele(nd.ni_vp); 2689 return (error); 2690 } 2691 2692 /* 2693 * Change flags of a file given a file descriptor. 2694 */ 2695 #ifndef _SYS_SYSPROTO_H_ 2696 struct fchflags_args { 2697 int fd; 2698 u_long flags; 2699 }; 2700 #endif 2701 int 2702 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2703 { 2704 struct file *fp; 2705 int error; 2706 2707 AUDIT_ARG_FD(uap->fd); 2708 AUDIT_ARG_FFLAGS(uap->flags); 2709 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2710 &fp); 2711 if (error != 0) 2712 return (error); 2713 #ifdef AUDIT 2714 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2715 AUDIT_ARG_VNODE1(fp->f_vnode); 2716 VOP_UNLOCK(fp->f_vnode, 0); 2717 #endif 2718 error = setfflags(td, fp->f_vnode, uap->flags); 2719 fdrop(fp, td); 2720 return (error); 2721 } 2722 2723 /* 2724 * Common implementation code for chmod(), lchmod() and fchmod(). 2725 */ 2726 int 2727 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2728 { 2729 struct mount *mp; 2730 struct vattr vattr; 2731 int error; 2732 2733 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2734 return (error); 2735 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2736 VATTR_NULL(&vattr); 2737 vattr.va_mode = mode & ALLPERMS; 2738 #ifdef MAC 2739 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2740 if (error == 0) 2741 #endif 2742 error = VOP_SETATTR(vp, &vattr, cred); 2743 VOP_UNLOCK(vp, 0); 2744 vn_finished_write(mp); 2745 return (error); 2746 } 2747 2748 /* 2749 * Change mode of a file given path name. 2750 */ 2751 #ifndef _SYS_SYSPROTO_H_ 2752 struct chmod_args { 2753 char *path; 2754 int mode; 2755 }; 2756 #endif 2757 int 2758 sys_chmod(struct thread *td, struct chmod_args *uap) 2759 { 2760 2761 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2762 uap->mode, 0)); 2763 } 2764 2765 #ifndef _SYS_SYSPROTO_H_ 2766 struct fchmodat_args { 2767 int dirfd; 2768 char *path; 2769 mode_t mode; 2770 int flag; 2771 } 2772 #endif 2773 int 2774 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2775 { 2776 2777 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 2778 return (EINVAL); 2779 2780 return (kern_fchmodat(td, uap->fd, uap->path, UIO_USERSPACE, 2781 uap->mode, uap->flag)); 2782 } 2783 2784 /* 2785 * Change mode of a file given path name (don't follow links.) 2786 */ 2787 #ifndef _SYS_SYSPROTO_H_ 2788 struct lchmod_args { 2789 char *path; 2790 int mode; 2791 }; 2792 #endif 2793 int 2794 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2795 { 2796 2797 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2798 uap->mode, AT_SYMLINK_NOFOLLOW)); 2799 } 2800 2801 int 2802 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2803 mode_t mode, int flag) 2804 { 2805 struct nameidata nd; 2806 int error; 2807 2808 AUDIT_ARG_MODE(mode); 2809 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 2810 AT_RESOLVE_BENEATH) | AUDITVNODE1, pathseg, path, fd, 2811 &cap_fchmod_rights, td); 2812 if ((error = namei(&nd)) != 0) 2813 return (error); 2814 NDFREE(&nd, NDF_ONLY_PNBUF); 2815 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2816 vrele(nd.ni_vp); 2817 return (error); 2818 } 2819 2820 /* 2821 * Change mode of a file given a file descriptor. 2822 */ 2823 #ifndef _SYS_SYSPROTO_H_ 2824 struct fchmod_args { 2825 int fd; 2826 int mode; 2827 }; 2828 #endif 2829 int 2830 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2831 { 2832 struct file *fp; 2833 int error; 2834 2835 AUDIT_ARG_FD(uap->fd); 2836 AUDIT_ARG_MODE(uap->mode); 2837 2838 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2839 if (error != 0) 2840 return (error); 2841 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2842 fdrop(fp, td); 2843 return (error); 2844 } 2845 2846 /* 2847 * Common implementation for chown(), lchown(), and fchown() 2848 */ 2849 int 2850 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2851 gid_t gid) 2852 { 2853 struct mount *mp; 2854 struct vattr vattr; 2855 int error; 2856 2857 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2858 return (error); 2859 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2860 VATTR_NULL(&vattr); 2861 vattr.va_uid = uid; 2862 vattr.va_gid = gid; 2863 #ifdef MAC 2864 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2865 vattr.va_gid); 2866 if (error == 0) 2867 #endif 2868 error = VOP_SETATTR(vp, &vattr, cred); 2869 VOP_UNLOCK(vp, 0); 2870 vn_finished_write(mp); 2871 return (error); 2872 } 2873 2874 /* 2875 * Set ownership given a path name. 2876 */ 2877 #ifndef _SYS_SYSPROTO_H_ 2878 struct chown_args { 2879 char *path; 2880 int uid; 2881 int gid; 2882 }; 2883 #endif 2884 int 2885 sys_chown(struct thread *td, struct chown_args *uap) 2886 { 2887 2888 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2889 uap->gid, 0)); 2890 } 2891 2892 #ifndef _SYS_SYSPROTO_H_ 2893 struct fchownat_args { 2894 int fd; 2895 const char * path; 2896 uid_t uid; 2897 gid_t gid; 2898 int flag; 2899 }; 2900 #endif 2901 int 2902 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2903 { 2904 2905 if ((uap->flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 2906 return (EINVAL); 2907 2908 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 2909 uap->gid, uap->flag)); 2910 } 2911 2912 int 2913 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2914 int uid, int gid, int flag) 2915 { 2916 struct nameidata nd; 2917 int error; 2918 2919 AUDIT_ARG_OWNER(uid, gid); 2920 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 2921 AT_RESOLVE_BENEATH) | AUDITVNODE1, pathseg, path, fd, 2922 &cap_fchown_rights, td); 2923 2924 if ((error = namei(&nd)) != 0) 2925 return (error); 2926 NDFREE(&nd, NDF_ONLY_PNBUF); 2927 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 2928 vrele(nd.ni_vp); 2929 return (error); 2930 } 2931 2932 /* 2933 * Set ownership given a path name, do not cross symlinks. 2934 */ 2935 #ifndef _SYS_SYSPROTO_H_ 2936 struct lchown_args { 2937 char *path; 2938 int uid; 2939 int gid; 2940 }; 2941 #endif 2942 int 2943 sys_lchown(struct thread *td, struct lchown_args *uap) 2944 { 2945 2946 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2947 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 2948 } 2949 2950 /* 2951 * Set ownership given a file descriptor. 2952 */ 2953 #ifndef _SYS_SYSPROTO_H_ 2954 struct fchown_args { 2955 int fd; 2956 int uid; 2957 int gid; 2958 }; 2959 #endif 2960 int 2961 sys_fchown(struct thread *td, struct fchown_args *uap) 2962 { 2963 struct file *fp; 2964 int error; 2965 2966 AUDIT_ARG_FD(uap->fd); 2967 AUDIT_ARG_OWNER(uap->uid, uap->gid); 2968 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 2969 if (error != 0) 2970 return (error); 2971 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 2972 fdrop(fp, td); 2973 return (error); 2974 } 2975 2976 /* 2977 * Common implementation code for utimes(), lutimes(), and futimes(). 2978 */ 2979 static int 2980 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 2981 struct timespec *tsp) 2982 { 2983 struct timeval tv[2]; 2984 const struct timeval *tvp; 2985 int error; 2986 2987 if (usrtvp == NULL) { 2988 vfs_timestamp(&tsp[0]); 2989 tsp[1] = tsp[0]; 2990 } else { 2991 if (tvpseg == UIO_SYSSPACE) { 2992 tvp = usrtvp; 2993 } else { 2994 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 2995 return (error); 2996 tvp = tv; 2997 } 2998 2999 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 3000 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 3001 return (EINVAL); 3002 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 3003 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 3004 } 3005 return (0); 3006 } 3007 3008 /* 3009 * Common implementation code for futimens(), utimensat(). 3010 */ 3011 #define UTIMENS_NULL 0x1 3012 #define UTIMENS_EXIT 0x2 3013 static int 3014 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 3015 struct timespec *tsp, int *retflags) 3016 { 3017 struct timespec tsnow; 3018 int error; 3019 3020 vfs_timestamp(&tsnow); 3021 *retflags = 0; 3022 if (usrtsp == NULL) { 3023 tsp[0] = tsnow; 3024 tsp[1] = tsnow; 3025 *retflags |= UTIMENS_NULL; 3026 return (0); 3027 } 3028 if (tspseg == UIO_SYSSPACE) { 3029 tsp[0] = usrtsp[0]; 3030 tsp[1] = usrtsp[1]; 3031 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 3032 return (error); 3033 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 3034 *retflags |= UTIMENS_EXIT; 3035 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 3036 *retflags |= UTIMENS_NULL; 3037 if (tsp[0].tv_nsec == UTIME_OMIT) 3038 tsp[0].tv_sec = VNOVAL; 3039 else if (tsp[0].tv_nsec == UTIME_NOW) 3040 tsp[0] = tsnow; 3041 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 3042 return (EINVAL); 3043 if (tsp[1].tv_nsec == UTIME_OMIT) 3044 tsp[1].tv_sec = VNOVAL; 3045 else if (tsp[1].tv_nsec == UTIME_NOW) 3046 tsp[1] = tsnow; 3047 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 3048 return (EINVAL); 3049 3050 return (0); 3051 } 3052 3053 /* 3054 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3055 * and utimensat(). 3056 */ 3057 static int 3058 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3059 int numtimes, int nullflag) 3060 { 3061 struct mount *mp; 3062 struct vattr vattr; 3063 int error, setbirthtime; 3064 3065 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3066 return (error); 3067 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3068 setbirthtime = 0; 3069 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3070 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3071 setbirthtime = 1; 3072 VATTR_NULL(&vattr); 3073 vattr.va_atime = ts[0]; 3074 vattr.va_mtime = ts[1]; 3075 if (setbirthtime) 3076 vattr.va_birthtime = ts[1]; 3077 if (numtimes > 2) 3078 vattr.va_birthtime = ts[2]; 3079 if (nullflag) 3080 vattr.va_vaflags |= VA_UTIMES_NULL; 3081 #ifdef MAC 3082 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3083 vattr.va_mtime); 3084 #endif 3085 if (error == 0) 3086 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3087 VOP_UNLOCK(vp, 0); 3088 vn_finished_write(mp); 3089 return (error); 3090 } 3091 3092 /* 3093 * Set the access and modification times of a file. 3094 */ 3095 #ifndef _SYS_SYSPROTO_H_ 3096 struct utimes_args { 3097 char *path; 3098 struct timeval *tptr; 3099 }; 3100 #endif 3101 int 3102 sys_utimes(struct thread *td, struct utimes_args *uap) 3103 { 3104 3105 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3106 uap->tptr, UIO_USERSPACE)); 3107 } 3108 3109 #ifndef _SYS_SYSPROTO_H_ 3110 struct futimesat_args { 3111 int fd; 3112 const char * path; 3113 const struct timeval * times; 3114 }; 3115 #endif 3116 int 3117 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3118 { 3119 3120 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3121 uap->times, UIO_USERSPACE)); 3122 } 3123 3124 int 3125 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3126 struct timeval *tptr, enum uio_seg tptrseg) 3127 { 3128 struct nameidata nd; 3129 struct timespec ts[2]; 3130 int error; 3131 3132 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3133 return (error); 3134 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3135 &cap_futimes_rights, td); 3136 3137 if ((error = namei(&nd)) != 0) 3138 return (error); 3139 NDFREE(&nd, NDF_ONLY_PNBUF); 3140 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3141 vrele(nd.ni_vp); 3142 return (error); 3143 } 3144 3145 /* 3146 * Set the access and modification times of a file. 3147 */ 3148 #ifndef _SYS_SYSPROTO_H_ 3149 struct lutimes_args { 3150 char *path; 3151 struct timeval *tptr; 3152 }; 3153 #endif 3154 int 3155 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3156 { 3157 3158 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3159 UIO_USERSPACE)); 3160 } 3161 3162 int 3163 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, 3164 struct timeval *tptr, enum uio_seg tptrseg) 3165 { 3166 struct timespec ts[2]; 3167 struct nameidata nd; 3168 int error; 3169 3170 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3171 return (error); 3172 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3173 if ((error = namei(&nd)) != 0) 3174 return (error); 3175 NDFREE(&nd, NDF_ONLY_PNBUF); 3176 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3177 vrele(nd.ni_vp); 3178 return (error); 3179 } 3180 3181 /* 3182 * Set the access and modification times of a file. 3183 */ 3184 #ifndef _SYS_SYSPROTO_H_ 3185 struct futimes_args { 3186 int fd; 3187 struct timeval *tptr; 3188 }; 3189 #endif 3190 int 3191 sys_futimes(struct thread *td, struct futimes_args *uap) 3192 { 3193 3194 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3195 } 3196 3197 int 3198 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3199 enum uio_seg tptrseg) 3200 { 3201 struct timespec ts[2]; 3202 struct file *fp; 3203 int error; 3204 3205 AUDIT_ARG_FD(fd); 3206 error = getutimes(tptr, tptrseg, ts); 3207 if (error != 0) 3208 return (error); 3209 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3210 if (error != 0) 3211 return (error); 3212 #ifdef AUDIT 3213 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3214 AUDIT_ARG_VNODE1(fp->f_vnode); 3215 VOP_UNLOCK(fp->f_vnode, 0); 3216 #endif 3217 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3218 fdrop(fp, td); 3219 return (error); 3220 } 3221 3222 int 3223 sys_futimens(struct thread *td, struct futimens_args *uap) 3224 { 3225 3226 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3227 } 3228 3229 int 3230 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3231 enum uio_seg tptrseg) 3232 { 3233 struct timespec ts[2]; 3234 struct file *fp; 3235 int error, flags; 3236 3237 AUDIT_ARG_FD(fd); 3238 error = getutimens(tptr, tptrseg, ts, &flags); 3239 if (error != 0) 3240 return (error); 3241 if (flags & UTIMENS_EXIT) 3242 return (0); 3243 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3244 if (error != 0) 3245 return (error); 3246 #ifdef AUDIT 3247 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3248 AUDIT_ARG_VNODE1(fp->f_vnode); 3249 VOP_UNLOCK(fp->f_vnode, 0); 3250 #endif 3251 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3252 fdrop(fp, td); 3253 return (error); 3254 } 3255 3256 int 3257 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3258 { 3259 3260 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3261 uap->times, UIO_USERSPACE, uap->flag)); 3262 } 3263 3264 int 3265 kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3266 struct timespec *tptr, enum uio_seg tptrseg, int flag) 3267 { 3268 struct nameidata nd; 3269 struct timespec ts[2]; 3270 int error, flags; 3271 3272 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 3273 return (EINVAL); 3274 3275 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3276 return (error); 3277 NDINIT_ATRIGHTS(&nd, LOOKUP, at2cnpflags(flag, AT_SYMLINK_NOFOLLOW | 3278 AT_RESOLVE_BENEATH) | AUDITVNODE1, 3279 pathseg, path, fd, &cap_futimes_rights, td); 3280 if ((error = namei(&nd)) != 0) 3281 return (error); 3282 /* 3283 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3284 * POSIX states: 3285 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3286 * "Search permission is denied by a component of the path prefix." 3287 */ 3288 NDFREE(&nd, NDF_ONLY_PNBUF); 3289 if ((flags & UTIMENS_EXIT) == 0) 3290 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3291 vrele(nd.ni_vp); 3292 return (error); 3293 } 3294 3295 /* 3296 * Truncate a file given its path name. 3297 */ 3298 #ifndef _SYS_SYSPROTO_H_ 3299 struct truncate_args { 3300 char *path; 3301 int pad; 3302 off_t length; 3303 }; 3304 #endif 3305 int 3306 sys_truncate(struct thread *td, struct truncate_args *uap) 3307 { 3308 3309 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3310 } 3311 3312 int 3313 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) 3314 { 3315 struct mount *mp; 3316 struct vnode *vp; 3317 void *rl_cookie; 3318 struct vattr vattr; 3319 struct nameidata nd; 3320 int error; 3321 3322 if (length < 0) 3323 return(EINVAL); 3324 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3325 if ((error = namei(&nd)) != 0) 3326 return (error); 3327 vp = nd.ni_vp; 3328 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3329 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3330 vn_rangelock_unlock(vp, rl_cookie); 3331 vrele(vp); 3332 return (error); 3333 } 3334 NDFREE(&nd, NDF_ONLY_PNBUF); 3335 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3336 if (vp->v_type == VDIR) 3337 error = EISDIR; 3338 #ifdef MAC 3339 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3340 } 3341 #endif 3342 else if ((error = vn_writechk(vp)) == 0 && 3343 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3344 VATTR_NULL(&vattr); 3345 vattr.va_size = length; 3346 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3347 } 3348 VOP_UNLOCK(vp, 0); 3349 vn_finished_write(mp); 3350 vn_rangelock_unlock(vp, rl_cookie); 3351 vrele(vp); 3352 return (error); 3353 } 3354 3355 #if defined(COMPAT_43) 3356 /* 3357 * Truncate a file given its path name. 3358 */ 3359 #ifndef _SYS_SYSPROTO_H_ 3360 struct otruncate_args { 3361 char *path; 3362 long length; 3363 }; 3364 #endif 3365 int 3366 otruncate(struct thread *td, struct otruncate_args *uap) 3367 { 3368 3369 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3370 } 3371 #endif /* COMPAT_43 */ 3372 3373 #if defined(COMPAT_FREEBSD6) 3374 /* Versions with the pad argument */ 3375 int 3376 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3377 { 3378 3379 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3380 } 3381 3382 int 3383 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3384 { 3385 3386 return (kern_ftruncate(td, uap->fd, uap->length)); 3387 } 3388 #endif 3389 3390 int 3391 kern_fsync(struct thread *td, int fd, bool fullsync) 3392 { 3393 struct vnode *vp; 3394 struct mount *mp; 3395 struct file *fp; 3396 int error, lock_flags; 3397 3398 AUDIT_ARG_FD(fd); 3399 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3400 if (error != 0) 3401 return (error); 3402 vp = fp->f_vnode; 3403 #if 0 3404 if (!fullsync) 3405 /* XXXKIB: compete outstanding aio writes */; 3406 #endif 3407 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3408 if (error != 0) 3409 goto drop; 3410 if (MNT_SHARED_WRITES(mp) || 3411 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3412 lock_flags = LK_SHARED; 3413 } else { 3414 lock_flags = LK_EXCLUSIVE; 3415 } 3416 vn_lock(vp, lock_flags | LK_RETRY); 3417 AUDIT_ARG_VNODE1(vp); 3418 if (vp->v_object != NULL) { 3419 VM_OBJECT_WLOCK(vp->v_object); 3420 vm_object_page_clean(vp->v_object, 0, 0, 0); 3421 VM_OBJECT_WUNLOCK(vp->v_object); 3422 } 3423 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3424 VOP_UNLOCK(vp, 0); 3425 vn_finished_write(mp); 3426 drop: 3427 fdrop(fp, td); 3428 return (error); 3429 } 3430 3431 /* 3432 * Sync an open file. 3433 */ 3434 #ifndef _SYS_SYSPROTO_H_ 3435 struct fsync_args { 3436 int fd; 3437 }; 3438 #endif 3439 int 3440 sys_fsync(struct thread *td, struct fsync_args *uap) 3441 { 3442 3443 return (kern_fsync(td, uap->fd, true)); 3444 } 3445 3446 int 3447 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3448 { 3449 3450 return (kern_fsync(td, uap->fd, false)); 3451 } 3452 3453 /* 3454 * Rename files. Source and destination must either both be directories, or 3455 * both not be directories. If target is a directory, it must be empty. 3456 */ 3457 #ifndef _SYS_SYSPROTO_H_ 3458 struct rename_args { 3459 char *from; 3460 char *to; 3461 }; 3462 #endif 3463 int 3464 sys_rename(struct thread *td, struct rename_args *uap) 3465 { 3466 3467 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3468 uap->to, UIO_USERSPACE)); 3469 } 3470 3471 #ifndef _SYS_SYSPROTO_H_ 3472 struct renameat_args { 3473 int oldfd; 3474 char *old; 3475 int newfd; 3476 char *new; 3477 }; 3478 #endif 3479 int 3480 sys_renameat(struct thread *td, struct renameat_args *uap) 3481 { 3482 3483 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3484 UIO_USERSPACE)); 3485 } 3486 3487 int 3488 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new, 3489 enum uio_seg pathseg) 3490 { 3491 struct mount *mp = NULL; 3492 struct vnode *tvp, *fvp, *tdvp; 3493 struct nameidata fromnd, tond; 3494 int error; 3495 3496 again: 3497 bwillwrite(); 3498 #ifdef MAC 3499 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3500 AUDITVNODE1, pathseg, old, oldfd, 3501 &cap_renameat_source_rights, td); 3502 if ((error = namei(&fromnd)) != 0) 3503 return (error); 3504 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3505 fromnd.ni_vp, &fromnd.ni_cnd); 3506 VOP_UNLOCK(fromnd.ni_dvp, 0); 3507 if (fromnd.ni_dvp != fromnd.ni_vp) 3508 VOP_UNLOCK(fromnd.ni_vp, 0); 3509 if (error != 0) { 3510 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3511 vrele(fromnd.ni_dvp); 3512 vrele(fromnd.ni_vp); 3513 if (fromnd.ni_startdir) 3514 vrele(fromnd.ni_startdir); 3515 return (error); 3516 } 3517 #else 3518 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3519 pathseg, old, oldfd, 3520 &cap_renameat_source_rights, td); 3521 if ((error = namei(&fromnd)) != 0) 3522 return (error); 3523 #endif 3524 fvp = fromnd.ni_vp; 3525 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3526 SAVESTART | AUDITVNODE2, pathseg, new, newfd, 3527 &cap_renameat_target_rights, td); 3528 if (fromnd.ni_vp->v_type == VDIR) 3529 tond.ni_cnd.cn_flags |= WILLBEDIR; 3530 if ((error = namei(&tond)) != 0) { 3531 /* Translate error code for rename("dir1", "dir2/."). */ 3532 if (error == EISDIR && fvp->v_type == VDIR) 3533 error = EINVAL; 3534 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3535 vrele(fromnd.ni_dvp); 3536 vrele(fvp); 3537 goto out1; 3538 } 3539 tdvp = tond.ni_dvp; 3540 tvp = tond.ni_vp; 3541 error = vn_start_write(fvp, &mp, V_NOWAIT); 3542 if (error != 0) { 3543 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3544 NDFREE(&tond, NDF_ONLY_PNBUF); 3545 if (tvp != NULL) 3546 vput(tvp); 3547 if (tdvp == tvp) 3548 vrele(tdvp); 3549 else 3550 vput(tdvp); 3551 vrele(fromnd.ni_dvp); 3552 vrele(fvp); 3553 vrele(tond.ni_startdir); 3554 if (fromnd.ni_startdir != NULL) 3555 vrele(fromnd.ni_startdir); 3556 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3557 if (error != 0) 3558 return (error); 3559 goto again; 3560 } 3561 if (tvp != NULL) { 3562 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3563 error = ENOTDIR; 3564 goto out; 3565 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3566 error = EISDIR; 3567 goto out; 3568 } 3569 #ifdef CAPABILITIES 3570 if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { 3571 /* 3572 * If the target already exists we require CAP_UNLINKAT 3573 * from 'newfd', when newfd was used for the lookup. 3574 */ 3575 error = cap_check(&tond.ni_filecaps.fc_rights, 3576 &cap_unlinkat_rights); 3577 if (error != 0) 3578 goto out; 3579 } 3580 #endif 3581 } 3582 if (fvp == tdvp) { 3583 error = EINVAL; 3584 goto out; 3585 } 3586 /* 3587 * If the source is the same as the destination (that is, if they 3588 * are links to the same vnode), then there is nothing to do. 3589 */ 3590 if (fvp == tvp) 3591 error = -1; 3592 #ifdef MAC 3593 else 3594 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3595 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3596 #endif 3597 out: 3598 if (error == 0) { 3599 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3600 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3601 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3602 NDFREE(&tond, NDF_ONLY_PNBUF); 3603 } else { 3604 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3605 NDFREE(&tond, NDF_ONLY_PNBUF); 3606 if (tvp != NULL) 3607 vput(tvp); 3608 if (tdvp == tvp) 3609 vrele(tdvp); 3610 else 3611 vput(tdvp); 3612 vrele(fromnd.ni_dvp); 3613 vrele(fvp); 3614 } 3615 vrele(tond.ni_startdir); 3616 vn_finished_write(mp); 3617 out1: 3618 if (fromnd.ni_startdir) 3619 vrele(fromnd.ni_startdir); 3620 if (error == -1) 3621 return (0); 3622 return (error); 3623 } 3624 3625 /* 3626 * Make a directory file. 3627 */ 3628 #ifndef _SYS_SYSPROTO_H_ 3629 struct mkdir_args { 3630 char *path; 3631 int mode; 3632 }; 3633 #endif 3634 int 3635 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3636 { 3637 3638 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3639 uap->mode)); 3640 } 3641 3642 #ifndef _SYS_SYSPROTO_H_ 3643 struct mkdirat_args { 3644 int fd; 3645 char *path; 3646 mode_t mode; 3647 }; 3648 #endif 3649 int 3650 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3651 { 3652 3653 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3654 } 3655 3656 int 3657 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg, 3658 int mode) 3659 { 3660 struct mount *mp; 3661 struct vnode *vp; 3662 struct vattr vattr; 3663 struct nameidata nd; 3664 int error; 3665 3666 AUDIT_ARG_MODE(mode); 3667 restart: 3668 bwillwrite(); 3669 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3670 NOCACHE, segflg, path, fd, &cap_mkdirat_rights, 3671 td); 3672 nd.ni_cnd.cn_flags |= WILLBEDIR; 3673 if ((error = namei(&nd)) != 0) 3674 return (error); 3675 vp = nd.ni_vp; 3676 if (vp != NULL) { 3677 NDFREE(&nd, NDF_ONLY_PNBUF); 3678 /* 3679 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3680 * the strange behaviour of leaving the vnode unlocked 3681 * if the target is the same vnode as the parent. 3682 */ 3683 if (vp == nd.ni_dvp) 3684 vrele(nd.ni_dvp); 3685 else 3686 vput(nd.ni_dvp); 3687 vrele(vp); 3688 return (EEXIST); 3689 } 3690 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3691 NDFREE(&nd, NDF_ONLY_PNBUF); 3692 vput(nd.ni_dvp); 3693 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3694 return (error); 3695 goto restart; 3696 } 3697 VATTR_NULL(&vattr); 3698 vattr.va_type = VDIR; 3699 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3700 #ifdef MAC 3701 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3702 &vattr); 3703 if (error != 0) 3704 goto out; 3705 #endif 3706 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3707 #ifdef MAC 3708 out: 3709 #endif 3710 NDFREE(&nd, NDF_ONLY_PNBUF); 3711 vput(nd.ni_dvp); 3712 if (error == 0) 3713 vput(nd.ni_vp); 3714 vn_finished_write(mp); 3715 return (error); 3716 } 3717 3718 /* 3719 * Remove a directory file. 3720 */ 3721 #ifndef _SYS_SYSPROTO_H_ 3722 struct rmdir_args { 3723 char *path; 3724 }; 3725 #endif 3726 int 3727 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3728 { 3729 3730 return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0)); 3731 } 3732 3733 int 3734 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3735 int flag) 3736 { 3737 struct mount *mp; 3738 struct vnode *vp; 3739 struct nameidata nd; 3740 int error; 3741 3742 restart: 3743 bwillwrite(); 3744 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1 | 3745 at2cnpflags(flag, AT_RESOLVE_BENEATH), 3746 pathseg, path, fd, &cap_unlinkat_rights, td); 3747 if ((error = namei(&nd)) != 0) 3748 return (error); 3749 vp = nd.ni_vp; 3750 if (vp->v_type != VDIR) { 3751 error = ENOTDIR; 3752 goto out; 3753 } 3754 /* 3755 * No rmdir "." please. 3756 */ 3757 if (nd.ni_dvp == vp) { 3758 error = EINVAL; 3759 goto out; 3760 } 3761 /* 3762 * The root of a mounted filesystem cannot be deleted. 3763 */ 3764 if (vp->v_vflag & VV_ROOT) { 3765 error = EBUSY; 3766 goto out; 3767 } 3768 #ifdef MAC 3769 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3770 &nd.ni_cnd); 3771 if (error != 0) 3772 goto out; 3773 #endif 3774 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3775 NDFREE(&nd, NDF_ONLY_PNBUF); 3776 vput(vp); 3777 if (nd.ni_dvp == vp) 3778 vrele(nd.ni_dvp); 3779 else 3780 vput(nd.ni_dvp); 3781 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3782 return (error); 3783 goto restart; 3784 } 3785 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3786 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3787 vn_finished_write(mp); 3788 out: 3789 NDFREE(&nd, NDF_ONLY_PNBUF); 3790 vput(vp); 3791 if (nd.ni_dvp == vp) 3792 vrele(nd.ni_dvp); 3793 else 3794 vput(nd.ni_dvp); 3795 return (error); 3796 } 3797 3798 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3799 int 3800 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3801 long *basep, void (*func)(struct freebsd11_dirent *)) 3802 { 3803 struct freebsd11_dirent dstdp; 3804 struct dirent *dp, *edp; 3805 char *dirbuf; 3806 off_t base; 3807 ssize_t resid, ucount; 3808 int error; 3809 3810 /* XXX arbitrary sanity limit on `count'. */ 3811 count = min(count, 64 * 1024); 3812 3813 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3814 3815 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3816 UIO_SYSSPACE); 3817 if (error != 0) 3818 goto done; 3819 if (basep != NULL) 3820 *basep = base; 3821 3822 ucount = 0; 3823 for (dp = (struct dirent *)dirbuf, 3824 edp = (struct dirent *)&dirbuf[count - resid]; 3825 ucount < count && dp < edp; ) { 3826 if (dp->d_reclen == 0) 3827 break; 3828 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3829 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3830 continue; 3831 dstdp.d_type = dp->d_type; 3832 dstdp.d_namlen = dp->d_namlen; 3833 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3834 if (dstdp.d_fileno != dp->d_fileno) { 3835 switch (ino64_trunc_error) { 3836 default: 3837 case 0: 3838 break; 3839 case 1: 3840 error = EOVERFLOW; 3841 goto done; 3842 case 2: 3843 dstdp.d_fileno = UINT32_MAX; 3844 break; 3845 } 3846 } 3847 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3848 ((dp->d_namlen + 1 + 3) &~ 3); 3849 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3850 bzero(dstdp.d_name + dstdp.d_namlen, 3851 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3852 dstdp.d_namlen); 3853 MPASS(dstdp.d_reclen <= dp->d_reclen); 3854 MPASS(ucount + dstdp.d_reclen <= count); 3855 if (func != NULL) 3856 func(&dstdp); 3857 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3858 if (error != 0) 3859 break; 3860 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3861 ucount += dstdp.d_reclen; 3862 } 3863 3864 done: 3865 free(dirbuf, M_TEMP); 3866 if (error == 0) 3867 td->td_retval[0] = ucount; 3868 return (error); 3869 } 3870 #endif /* COMPAT */ 3871 3872 #ifdef COMPAT_43 3873 static void 3874 ogetdirentries_cvt(struct freebsd11_dirent *dp) 3875 { 3876 #if (BYTE_ORDER == LITTLE_ENDIAN) 3877 /* 3878 * The expected low byte of dp->d_namlen is our dp->d_type. 3879 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 3880 */ 3881 dp->d_type = dp->d_namlen; 3882 dp->d_namlen = 0; 3883 #else 3884 /* 3885 * The dp->d_type is the high byte of the expected dp->d_namlen, 3886 * so must be zero'ed. 3887 */ 3888 dp->d_type = 0; 3889 #endif 3890 } 3891 3892 /* 3893 * Read a block of directory entries in a filesystem independent format. 3894 */ 3895 #ifndef _SYS_SYSPROTO_H_ 3896 struct ogetdirentries_args { 3897 int fd; 3898 char *buf; 3899 u_int count; 3900 long *basep; 3901 }; 3902 #endif 3903 int 3904 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3905 { 3906 long loff; 3907 int error; 3908 3909 error = kern_ogetdirentries(td, uap, &loff); 3910 if (error == 0) 3911 error = copyout(&loff, uap->basep, sizeof(long)); 3912 return (error); 3913 } 3914 3915 int 3916 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3917 long *ploff) 3918 { 3919 long base; 3920 int error; 3921 3922 /* XXX arbitrary sanity limit on `count'. */ 3923 if (uap->count > 64 * 1024) 3924 return (EINVAL); 3925 3926 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3927 &base, ogetdirentries_cvt); 3928 3929 if (error == 0 && uap->basep != NULL) 3930 error = copyout(&base, uap->basep, sizeof(long)); 3931 3932 return (error); 3933 } 3934 #endif /* COMPAT_43 */ 3935 3936 #if defined(COMPAT_FREEBSD11) 3937 #ifndef _SYS_SYSPROTO_H_ 3938 struct freebsd11_getdirentries_args { 3939 int fd; 3940 char *buf; 3941 u_int count; 3942 long *basep; 3943 }; 3944 #endif 3945 int 3946 freebsd11_getdirentries(struct thread *td, 3947 struct freebsd11_getdirentries_args *uap) 3948 { 3949 long base; 3950 int error; 3951 3952 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3953 &base, NULL); 3954 3955 if (error == 0 && uap->basep != NULL) 3956 error = copyout(&base, uap->basep, sizeof(long)); 3957 return (error); 3958 } 3959 3960 int 3961 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 3962 { 3963 struct freebsd11_getdirentries_args ap; 3964 3965 ap.fd = uap->fd; 3966 ap.buf = uap->buf; 3967 ap.count = uap->count; 3968 ap.basep = NULL; 3969 return (freebsd11_getdirentries(td, &ap)); 3970 } 3971 #endif /* COMPAT_FREEBSD11 */ 3972 3973 /* 3974 * Read a block of directory entries in a filesystem independent format. 3975 */ 3976 int 3977 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 3978 { 3979 off_t base; 3980 int error; 3981 3982 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 3983 NULL, UIO_USERSPACE); 3984 if (error != 0) 3985 return (error); 3986 if (uap->basep != NULL) 3987 error = copyout(&base, uap->basep, sizeof(off_t)); 3988 return (error); 3989 } 3990 3991 int 3992 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 3993 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 3994 { 3995 struct vnode *vp; 3996 struct file *fp; 3997 struct uio auio; 3998 struct iovec aiov; 3999 off_t loff; 4000 int error, eofflag; 4001 off_t foffset; 4002 4003 AUDIT_ARG_FD(fd); 4004 if (count > IOSIZE_MAX) 4005 return (EINVAL); 4006 auio.uio_resid = count; 4007 error = getvnode(td, fd, &cap_read_rights, &fp); 4008 if (error != 0) 4009 return (error); 4010 if ((fp->f_flag & FREAD) == 0) { 4011 fdrop(fp, td); 4012 return (EBADF); 4013 } 4014 vp = fp->f_vnode; 4015 foffset = foffset_lock(fp, 0); 4016 unionread: 4017 if (vp->v_type != VDIR) { 4018 error = EINVAL; 4019 goto fail; 4020 } 4021 aiov.iov_base = buf; 4022 aiov.iov_len = count; 4023 auio.uio_iov = &aiov; 4024 auio.uio_iovcnt = 1; 4025 auio.uio_rw = UIO_READ; 4026 auio.uio_segflg = bufseg; 4027 auio.uio_td = td; 4028 vn_lock(vp, LK_SHARED | LK_RETRY); 4029 AUDIT_ARG_VNODE1(vp); 4030 loff = auio.uio_offset = foffset; 4031 #ifdef MAC 4032 error = mac_vnode_check_readdir(td->td_ucred, vp); 4033 if (error == 0) 4034 #endif 4035 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 4036 NULL); 4037 foffset = auio.uio_offset; 4038 if (error != 0) { 4039 VOP_UNLOCK(vp, 0); 4040 goto fail; 4041 } 4042 if (count == auio.uio_resid && 4043 (vp->v_vflag & VV_ROOT) && 4044 (vp->v_mount->mnt_flag & MNT_UNION)) { 4045 struct vnode *tvp = vp; 4046 4047 vp = vp->v_mount->mnt_vnodecovered; 4048 VREF(vp); 4049 fp->f_vnode = vp; 4050 fp->f_data = vp; 4051 foffset = 0; 4052 vput(tvp); 4053 goto unionread; 4054 } 4055 VOP_UNLOCK(vp, 0); 4056 *basep = loff; 4057 if (residp != NULL) 4058 *residp = auio.uio_resid; 4059 td->td_retval[0] = count - auio.uio_resid; 4060 fail: 4061 foffset_unlock(fp, foffset, 0); 4062 fdrop(fp, td); 4063 return (error); 4064 } 4065 4066 /* 4067 * Set the mode mask for creation of filesystem nodes. 4068 */ 4069 #ifndef _SYS_SYSPROTO_H_ 4070 struct umask_args { 4071 int newmask; 4072 }; 4073 #endif 4074 int 4075 sys_umask(struct thread *td, struct umask_args *uap) 4076 { 4077 struct filedesc *fdp; 4078 4079 fdp = td->td_proc->p_fd; 4080 FILEDESC_XLOCK(fdp); 4081 td->td_retval[0] = fdp->fd_cmask; 4082 fdp->fd_cmask = uap->newmask & ALLPERMS; 4083 FILEDESC_XUNLOCK(fdp); 4084 return (0); 4085 } 4086 4087 /* 4088 * Void all references to file by ripping underlying filesystem away from 4089 * vnode. 4090 */ 4091 #ifndef _SYS_SYSPROTO_H_ 4092 struct revoke_args { 4093 char *path; 4094 }; 4095 #endif 4096 int 4097 sys_revoke(struct thread *td, struct revoke_args *uap) 4098 { 4099 struct vnode *vp; 4100 struct vattr vattr; 4101 struct nameidata nd; 4102 int error; 4103 4104 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4105 uap->path, td); 4106 if ((error = namei(&nd)) != 0) 4107 return (error); 4108 vp = nd.ni_vp; 4109 NDFREE(&nd, NDF_ONLY_PNBUF); 4110 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4111 error = EINVAL; 4112 goto out; 4113 } 4114 #ifdef MAC 4115 error = mac_vnode_check_revoke(td->td_ucred, vp); 4116 if (error != 0) 4117 goto out; 4118 #endif 4119 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4120 if (error != 0) 4121 goto out; 4122 if (td->td_ucred->cr_uid != vattr.va_uid) { 4123 error = priv_check(td, PRIV_VFS_ADMIN); 4124 if (error != 0) 4125 goto out; 4126 } 4127 if (vcount(vp) > 1) 4128 VOP_REVOKE(vp, REVOKEALL); 4129 out: 4130 vput(vp); 4131 return (error); 4132 } 4133 4134 /* 4135 * Convert a user file descriptor to a kernel file entry and check that, if it 4136 * is a capability, the correct rights are present. A reference on the file 4137 * entry is held upon returning. 4138 */ 4139 int 4140 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4141 { 4142 struct file *fp; 4143 int error; 4144 4145 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); 4146 if (error != 0) 4147 return (error); 4148 4149 /* 4150 * The file could be not of the vnode type, or it may be not 4151 * yet fully initialized, in which case the f_vnode pointer 4152 * may be set, but f_ops is still badfileops. E.g., 4153 * devfs_open() transiently create such situation to 4154 * facilitate csw d_fdopen(). 4155 * 4156 * Dupfdopen() handling in kern_openat() installs the 4157 * half-baked file into the process descriptor table, allowing 4158 * other thread to dereference it. Guard against the race by 4159 * checking f_ops. 4160 */ 4161 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4162 fdrop(fp, td); 4163 return (EINVAL); 4164 } 4165 *fpp = fp; 4166 return (0); 4167 } 4168 4169 4170 /* 4171 * Get an (NFS) file handle. 4172 */ 4173 #ifndef _SYS_SYSPROTO_H_ 4174 struct lgetfh_args { 4175 char *fname; 4176 fhandle_t *fhp; 4177 }; 4178 #endif 4179 int 4180 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4181 { 4182 4183 return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, 4184 UIO_USERSPACE, uap->fhp)); 4185 } 4186 4187 #ifndef _SYS_SYSPROTO_H_ 4188 struct getfh_args { 4189 char *fname; 4190 fhandle_t *fhp; 4191 }; 4192 #endif 4193 int 4194 sys_getfh(struct thread *td, struct getfh_args *uap) 4195 { 4196 4197 return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, 4198 uap->fhp)); 4199 } 4200 4201 /* 4202 * syscall for the rpc.lockd to use to translate an open descriptor into 4203 * a NFS file handle. 4204 * 4205 * warning: do not remove the priv_check() call or this becomes one giant 4206 * security hole. 4207 */ 4208 #ifndef _SYS_SYSPROTO_H_ 4209 struct getfhat_args { 4210 int fd; 4211 char *path; 4212 fhandle_t *fhp; 4213 int flags; 4214 }; 4215 #endif 4216 int 4217 sys_getfhat(struct thread *td, struct getfhat_args *uap) 4218 { 4219 4220 if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW | AT_RESOLVE_BENEATH)) != 0) 4221 return (EINVAL); 4222 return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, 4223 uap->fhp)); 4224 } 4225 4226 static int 4227 kern_getfhat(struct thread *td, int flags, int fd, const char *path, 4228 enum uio_seg pathseg, fhandle_t *fhp) 4229 { 4230 struct nameidata nd; 4231 fhandle_t fh; 4232 struct vnode *vp; 4233 int error; 4234 4235 error = priv_check(td, PRIV_VFS_GETFH); 4236 if (error != 0) 4237 return (error); 4238 NDINIT_AT(&nd, LOOKUP, at2cnpflags(flags, AT_SYMLINK_NOFOLLOW | 4239 AT_RESOLVE_BENEATH) | LOCKLEAF | AUDITVNODE1, pathseg, path, 4240 fd, td); 4241 error = namei(&nd); 4242 if (error != 0) 4243 return (error); 4244 NDFREE(&nd, NDF_ONLY_PNBUF); 4245 vp = nd.ni_vp; 4246 bzero(&fh, sizeof(fh)); 4247 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4248 error = VOP_VPTOFH(vp, &fh.fh_fid); 4249 vput(vp); 4250 if (error == 0) 4251 error = copyout(&fh, fhp, sizeof (fh)); 4252 return (error); 4253 } 4254 4255 #ifndef _SYS_SYSPROTO_H_ 4256 struct fhlink_args { 4257 fhandle_t *fhp; 4258 const char *to; 4259 }; 4260 #endif 4261 int 4262 sys_fhlink(struct thread *td, struct fhlink_args *uap) 4263 { 4264 4265 return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); 4266 } 4267 4268 #ifndef _SYS_SYSPROTO_H_ 4269 struct fhlinkat_args { 4270 fhandle_t *fhp; 4271 int tofd; 4272 const char *to; 4273 }; 4274 #endif 4275 int 4276 sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) 4277 { 4278 4279 return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); 4280 } 4281 4282 static int 4283 kern_fhlinkat(struct thread *td, int fd, const char *path, 4284 enum uio_seg pathseg, fhandle_t *fhp) 4285 { 4286 fhandle_t fh; 4287 struct mount *mp; 4288 struct vnode *vp; 4289 int error; 4290 4291 error = priv_check(td, PRIV_VFS_GETFH); 4292 if (error != 0) 4293 return (error); 4294 error = copyin(fhp, &fh, sizeof(fh)); 4295 if (error != 0) 4296 return (error); 4297 do { 4298 bwillwrite(); 4299 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4300 return (ESTALE); 4301 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4302 vfs_unbusy(mp); 4303 if (error != 0) 4304 return (error); 4305 VOP_UNLOCK(vp, 0); 4306 } while ((error = kern_linkat_vp(td, vp, fd, path, pathseg)) == EAGAIN); 4307 return (error); 4308 } 4309 4310 #ifndef _SYS_SYSPROTO_H_ 4311 struct fhreadlink_args { 4312 fhandle_t *fhp; 4313 char *buf; 4314 size_t bufsize; 4315 }; 4316 #endif 4317 int 4318 sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) 4319 { 4320 fhandle_t fh; 4321 struct mount *mp; 4322 struct vnode *vp; 4323 int error; 4324 4325 error = priv_check(td, PRIV_VFS_GETFH); 4326 if (error != 0) 4327 return (error); 4328 if (uap->bufsize > IOSIZE_MAX) 4329 return (EINVAL); 4330 error = copyin(uap->fhp, &fh, sizeof(fh)); 4331 if (error != 0) 4332 return (error); 4333 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4334 return (ESTALE); 4335 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); 4336 vfs_unbusy(mp); 4337 if (error != 0) 4338 return (error); 4339 error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); 4340 vput(vp); 4341 return (error); 4342 } 4343 4344 /* 4345 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4346 * open descriptor. 4347 * 4348 * warning: do not remove the priv_check() call or this becomes one giant 4349 * security hole. 4350 */ 4351 #ifndef _SYS_SYSPROTO_H_ 4352 struct fhopen_args { 4353 const struct fhandle *u_fhp; 4354 int flags; 4355 }; 4356 #endif 4357 int 4358 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4359 { 4360 struct mount *mp; 4361 struct vnode *vp; 4362 struct fhandle fhp; 4363 struct file *fp; 4364 int fmode, error; 4365 int indx; 4366 4367 error = priv_check(td, PRIV_VFS_FHOPEN); 4368 if (error != 0) 4369 return (error); 4370 indx = -1; 4371 fmode = FFLAGS(uap->flags); 4372 /* why not allow a non-read/write open for our lockd? */ 4373 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4374 return (EINVAL); 4375 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4376 if (error != 0) 4377 return(error); 4378 /* find the mount point */ 4379 mp = vfs_busyfs(&fhp.fh_fsid); 4380 if (mp == NULL) 4381 return (ESTALE); 4382 /* now give me my vnode, it gets returned to me locked */ 4383 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4384 vfs_unbusy(mp); 4385 if (error != 0) 4386 return (error); 4387 4388 error = falloc_noinstall(td, &fp); 4389 if (error != 0) { 4390 vput(vp); 4391 return (error); 4392 } 4393 /* 4394 * An extra reference on `fp' has been held for us by 4395 * falloc_noinstall(). 4396 */ 4397 4398 #ifdef INVARIANTS 4399 td->td_dupfd = -1; 4400 #endif 4401 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4402 if (error != 0) { 4403 KASSERT(fp->f_ops == &badfileops, 4404 ("VOP_OPEN in fhopen() set f_ops")); 4405 KASSERT(td->td_dupfd < 0, 4406 ("fhopen() encountered fdopen()")); 4407 4408 vput(vp); 4409 goto bad; 4410 } 4411 #ifdef INVARIANTS 4412 td->td_dupfd = 0; 4413 #endif 4414 fp->f_vnode = vp; 4415 fp->f_seqcount = 1; 4416 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp, 4417 &vnops); 4418 VOP_UNLOCK(vp, 0); 4419 if ((fmode & O_TRUNC) != 0) { 4420 error = fo_truncate(fp, 0, td->td_ucred, td); 4421 if (error != 0) 4422 goto bad; 4423 } 4424 4425 error = finstall(td, fp, &indx, fmode, NULL); 4426 bad: 4427 fdrop(fp, td); 4428 td->td_retval[0] = indx; 4429 return (error); 4430 } 4431 4432 /* 4433 * Stat an (NFS) file handle. 4434 */ 4435 #ifndef _SYS_SYSPROTO_H_ 4436 struct fhstat_args { 4437 struct fhandle *u_fhp; 4438 struct stat *sb; 4439 }; 4440 #endif 4441 int 4442 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4443 { 4444 struct stat sb; 4445 struct fhandle fh; 4446 int error; 4447 4448 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4449 if (error != 0) 4450 return (error); 4451 error = kern_fhstat(td, fh, &sb); 4452 if (error == 0) 4453 error = copyout(&sb, uap->sb, sizeof(sb)); 4454 return (error); 4455 } 4456 4457 int 4458 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4459 { 4460 struct mount *mp; 4461 struct vnode *vp; 4462 int error; 4463 4464 error = priv_check(td, PRIV_VFS_FHSTAT); 4465 if (error != 0) 4466 return (error); 4467 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4468 return (ESTALE); 4469 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4470 vfs_unbusy(mp); 4471 if (error != 0) 4472 return (error); 4473 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td); 4474 vput(vp); 4475 return (error); 4476 } 4477 4478 /* 4479 * Implement fstatfs() for (NFS) file handles. 4480 */ 4481 #ifndef _SYS_SYSPROTO_H_ 4482 struct fhstatfs_args { 4483 struct fhandle *u_fhp; 4484 struct statfs *buf; 4485 }; 4486 #endif 4487 int 4488 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4489 { 4490 struct statfs *sfp; 4491 fhandle_t fh; 4492 int error; 4493 4494 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4495 if (error != 0) 4496 return (error); 4497 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4498 error = kern_fhstatfs(td, fh, sfp); 4499 if (error == 0) 4500 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4501 free(sfp, M_STATFS); 4502 return (error); 4503 } 4504 4505 int 4506 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4507 { 4508 struct statfs *sp; 4509 struct mount *mp; 4510 struct vnode *vp; 4511 int error; 4512 4513 error = priv_check(td, PRIV_VFS_FHSTATFS); 4514 if (error != 0) 4515 return (error); 4516 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4517 return (ESTALE); 4518 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4519 if (error != 0) { 4520 vfs_unbusy(mp); 4521 return (error); 4522 } 4523 vput(vp); 4524 error = prison_canseemount(td->td_ucred, mp); 4525 if (error != 0) 4526 goto out; 4527 #ifdef MAC 4528 error = mac_mount_check_stat(td->td_ucred, mp); 4529 if (error != 0) 4530 goto out; 4531 #endif 4532 /* 4533 * Set these in case the underlying filesystem fails to do so. 4534 */ 4535 sp = &mp->mnt_stat; 4536 sp->f_version = STATFS_VERSION; 4537 sp->f_namemax = NAME_MAX; 4538 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 4539 error = VFS_STATFS(mp, sp); 4540 if (error == 0) 4541 *buf = *sp; 4542 out: 4543 vfs_unbusy(mp); 4544 return (error); 4545 } 4546 4547 int 4548 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len) 4549 { 4550 struct file *fp; 4551 struct mount *mp; 4552 struct vnode *vp; 4553 off_t olen, ooffset; 4554 int error; 4555 #ifdef AUDIT 4556 int audited_vnode1 = 0; 4557 #endif 4558 4559 AUDIT_ARG_FD(fd); 4560 if (offset < 0 || len <= 0) 4561 return (EINVAL); 4562 /* Check for wrap. */ 4563 if (offset > OFF_MAX - len) 4564 return (EFBIG); 4565 AUDIT_ARG_FD(fd); 4566 error = fget(td, fd, &cap_pwrite_rights, &fp); 4567 if (error != 0) 4568 return (error); 4569 AUDIT_ARG_FILE(td->td_proc, fp); 4570 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4571 error = ESPIPE; 4572 goto out; 4573 } 4574 if ((fp->f_flag & FWRITE) == 0) { 4575 error = EBADF; 4576 goto out; 4577 } 4578 if (fp->f_type != DTYPE_VNODE) { 4579 error = ENODEV; 4580 goto out; 4581 } 4582 vp = fp->f_vnode; 4583 if (vp->v_type != VREG) { 4584 error = ENODEV; 4585 goto out; 4586 } 4587 4588 /* Allocating blocks may take a long time, so iterate. */ 4589 for (;;) { 4590 olen = len; 4591 ooffset = offset; 4592 4593 bwillwrite(); 4594 mp = NULL; 4595 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 4596 if (error != 0) 4597 break; 4598 error = vn_lock(vp, LK_EXCLUSIVE); 4599 if (error != 0) { 4600 vn_finished_write(mp); 4601 break; 4602 } 4603 #ifdef AUDIT 4604 if (!audited_vnode1) { 4605 AUDIT_ARG_VNODE1(vp); 4606 audited_vnode1 = 1; 4607 } 4608 #endif 4609 #ifdef MAC 4610 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp); 4611 if (error == 0) 4612 #endif 4613 error = VOP_ALLOCATE(vp, &offset, &len); 4614 VOP_UNLOCK(vp, 0); 4615 vn_finished_write(mp); 4616 4617 if (olen + ooffset != offset + len) { 4618 panic("offset + len changed from %jx/%jx to %jx/%jx", 4619 ooffset, olen, offset, len); 4620 } 4621 if (error != 0 || len == 0) 4622 break; 4623 KASSERT(olen > len, ("Iteration did not make progress?")); 4624 maybe_yield(); 4625 } 4626 out: 4627 fdrop(fp, td); 4628 return (error); 4629 } 4630 4631 int 4632 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap) 4633 { 4634 int error; 4635 4636 error = kern_posix_fallocate(td, uap->fd, uap->offset, uap->len); 4637 return (kern_posix_error(td, error)); 4638 } 4639 4640 /* 4641 * Unlike madvise(2), we do not make a best effort to remember every 4642 * possible caching hint. Instead, we remember the last setting with 4643 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4644 * region of any current setting. 4645 */ 4646 int 4647 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4648 int advice) 4649 { 4650 struct fadvise_info *fa, *new; 4651 struct file *fp; 4652 struct vnode *vp; 4653 off_t end; 4654 int error; 4655 4656 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4657 return (EINVAL); 4658 AUDIT_ARG_VALUE(advice); 4659 switch (advice) { 4660 case POSIX_FADV_SEQUENTIAL: 4661 case POSIX_FADV_RANDOM: 4662 case POSIX_FADV_NOREUSE: 4663 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4664 break; 4665 case POSIX_FADV_NORMAL: 4666 case POSIX_FADV_WILLNEED: 4667 case POSIX_FADV_DONTNEED: 4668 new = NULL; 4669 break; 4670 default: 4671 return (EINVAL); 4672 } 4673 /* XXX: CAP_POSIX_FADVISE? */ 4674 AUDIT_ARG_FD(fd); 4675 error = fget(td, fd, &cap_no_rights, &fp); 4676 if (error != 0) 4677 goto out; 4678 AUDIT_ARG_FILE(td->td_proc, fp); 4679 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4680 error = ESPIPE; 4681 goto out; 4682 } 4683 if (fp->f_type != DTYPE_VNODE) { 4684 error = ENODEV; 4685 goto out; 4686 } 4687 vp = fp->f_vnode; 4688 if (vp->v_type != VREG) { 4689 error = ENODEV; 4690 goto out; 4691 } 4692 if (len == 0) 4693 end = OFF_MAX; 4694 else 4695 end = offset + len - 1; 4696 switch (advice) { 4697 case POSIX_FADV_SEQUENTIAL: 4698 case POSIX_FADV_RANDOM: 4699 case POSIX_FADV_NOREUSE: 4700 /* 4701 * Try to merge any existing non-standard region with 4702 * this new region if possible, otherwise create a new 4703 * non-standard region for this request. 4704 */ 4705 mtx_pool_lock(mtxpool_sleep, fp); 4706 fa = fp->f_advice; 4707 if (fa != NULL && fa->fa_advice == advice && 4708 ((fa->fa_start <= end && fa->fa_end >= offset) || 4709 (end != OFF_MAX && fa->fa_start == end + 1) || 4710 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4711 if (offset < fa->fa_start) 4712 fa->fa_start = offset; 4713 if (end > fa->fa_end) 4714 fa->fa_end = end; 4715 } else { 4716 new->fa_advice = advice; 4717 new->fa_start = offset; 4718 new->fa_end = end; 4719 fp->f_advice = new; 4720 new = fa; 4721 } 4722 mtx_pool_unlock(mtxpool_sleep, fp); 4723 break; 4724 case POSIX_FADV_NORMAL: 4725 /* 4726 * If a the "normal" region overlaps with an existing 4727 * non-standard region, trim or remove the 4728 * non-standard region. 4729 */ 4730 mtx_pool_lock(mtxpool_sleep, fp); 4731 fa = fp->f_advice; 4732 if (fa != NULL) { 4733 if (offset <= fa->fa_start && end >= fa->fa_end) { 4734 new = fa; 4735 fp->f_advice = NULL; 4736 } else if (offset <= fa->fa_start && 4737 end >= fa->fa_start) 4738 fa->fa_start = end + 1; 4739 else if (offset <= fa->fa_end && end >= fa->fa_end) 4740 fa->fa_end = offset - 1; 4741 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4742 /* 4743 * If the "normal" region is a middle 4744 * portion of the existing 4745 * non-standard region, just remove 4746 * the whole thing rather than picking 4747 * one side or the other to 4748 * preserve. 4749 */ 4750 new = fa; 4751 fp->f_advice = NULL; 4752 } 4753 } 4754 mtx_pool_unlock(mtxpool_sleep, fp); 4755 break; 4756 case POSIX_FADV_WILLNEED: 4757 case POSIX_FADV_DONTNEED: 4758 error = VOP_ADVISE(vp, offset, end, advice); 4759 break; 4760 } 4761 out: 4762 if (fp != NULL) 4763 fdrop(fp, td); 4764 free(new, M_FADVISE); 4765 return (error); 4766 } 4767 4768 int 4769 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4770 { 4771 int error; 4772 4773 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4774 uap->advice); 4775 return (kern_posix_error(td, error)); 4776 }
Cache object: 9e0d25826335314080ef9dc003ac7bcc
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