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