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); 108 109 /* 110 * Sync each mounted filesystem. 111 */ 112 #ifndef _SYS_SYSPROTO_H_ 113 struct sync_args { 114 int dummy; 115 }; 116 #endif 117 /* ARGSUSED */ 118 int 119 sys_sync(struct thread *td, struct sync_args *uap) 120 { 121 struct mount *mp, *nmp; 122 int save; 123 124 mtx_lock(&mountlist_mtx); 125 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 126 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 127 nmp = TAILQ_NEXT(mp, mnt_list); 128 continue; 129 } 130 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 131 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 132 save = curthread_pflags_set(TDP_SYNCIO); 133 vfs_msync(mp, MNT_NOWAIT); 134 VFS_SYNC(mp, MNT_NOWAIT); 135 curthread_pflags_restore(save); 136 vn_finished_write(mp); 137 } 138 mtx_lock(&mountlist_mtx); 139 nmp = TAILQ_NEXT(mp, mnt_list); 140 vfs_unbusy(mp); 141 } 142 mtx_unlock(&mountlist_mtx); 143 return (0); 144 } 145 146 /* 147 * Change filesystem quotas. 148 */ 149 #ifndef _SYS_SYSPROTO_H_ 150 struct quotactl_args { 151 char *path; 152 int cmd; 153 int uid; 154 caddr_t arg; 155 }; 156 #endif 157 int 158 sys_quotactl(struct thread *td, struct quotactl_args *uap) 159 { 160 struct mount *mp; 161 struct nameidata nd; 162 int error; 163 164 AUDIT_ARG_CMD(uap->cmd); 165 AUDIT_ARG_UID(uap->uid); 166 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 167 return (EPERM); 168 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 169 uap->path, td); 170 if ((error = namei(&nd)) != 0) 171 return (error); 172 NDFREE(&nd, NDF_ONLY_PNBUF); 173 mp = nd.ni_vp->v_mount; 174 vfs_ref(mp); 175 vput(nd.ni_vp); 176 error = vfs_busy(mp, 0); 177 vfs_rel(mp); 178 if (error != 0) 179 return (error); 180 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); 181 182 /* 183 * Since quota on operation typically needs to open quota 184 * file, the Q_QUOTAON handler needs to unbusy the mount point 185 * before calling into namei. Otherwise, unmount might be 186 * started between two vfs_busy() invocations (first is our, 187 * second is from mount point cross-walk code in lookup()), 188 * causing deadlock. 189 * 190 * Require that Q_QUOTAON handles the vfs_busy() reference on 191 * its own, always returning with ubusied mount point. 192 */ 193 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON) 194 vfs_unbusy(mp); 195 return (error); 196 } 197 198 /* 199 * Used by statfs conversion routines to scale the block size up if 200 * necessary so that all of the block counts are <= 'max_size'. Note 201 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 202 * value of 'n'. 203 */ 204 void 205 statfs_scale_blocks(struct statfs *sf, long max_size) 206 { 207 uint64_t count; 208 int shift; 209 210 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 211 212 /* 213 * Attempt to scale the block counts to give a more accurate 214 * overview to userland of the ratio of free space to used 215 * space. To do this, find the largest block count and compute 216 * a divisor that lets it fit into a signed integer <= max_size. 217 */ 218 if (sf->f_bavail < 0) 219 count = -sf->f_bavail; 220 else 221 count = sf->f_bavail; 222 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 223 if (count <= max_size) 224 return; 225 226 count >>= flsl(max_size); 227 shift = 0; 228 while (count > 0) { 229 shift++; 230 count >>=1; 231 } 232 233 sf->f_bsize <<= shift; 234 sf->f_blocks >>= shift; 235 sf->f_bfree >>= shift; 236 sf->f_bavail >>= shift; 237 } 238 239 static int 240 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 241 { 242 struct statfs *sp; 243 int error; 244 245 if (mp == NULL) 246 return (EBADF); 247 error = vfs_busy(mp, 0); 248 vfs_rel(mp); 249 if (error != 0) 250 return (error); 251 #ifdef MAC 252 error = mac_mount_check_stat(td->td_ucred, mp); 253 if (error != 0) 254 goto out; 255 #endif 256 /* 257 * Set these in case the underlying filesystem fails to do so. 258 */ 259 sp = &mp->mnt_stat; 260 sp->f_version = STATFS_VERSION; 261 sp->f_namemax = NAME_MAX; 262 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 263 error = VFS_STATFS(mp, sp); 264 if (error != 0) 265 goto out; 266 *buf = *sp; 267 if (priv_check(td, PRIV_VFS_GENERATION)) { 268 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 269 prison_enforce_statfs(td->td_ucred, mp, buf); 270 } 271 out: 272 vfs_unbusy(mp); 273 return (error); 274 } 275 276 /* 277 * Get filesystem statistics. 278 */ 279 #ifndef _SYS_SYSPROTO_H_ 280 struct statfs_args { 281 char *path; 282 struct statfs *buf; 283 }; 284 #endif 285 int 286 sys_statfs(struct thread *td, struct statfs_args *uap) 287 { 288 struct statfs *sfp; 289 int error; 290 291 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 292 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 293 if (error == 0) 294 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 295 free(sfp, M_STATFS); 296 return (error); 297 } 298 299 int 300 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg, 301 struct statfs *buf) 302 { 303 struct mount *mp; 304 struct nameidata nd; 305 int error; 306 307 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 308 pathseg, path, td); 309 error = namei(&nd); 310 if (error != 0) 311 return (error); 312 mp = nd.ni_vp->v_mount; 313 vfs_ref(mp); 314 NDFREE(&nd, NDF_ONLY_PNBUF); 315 vput(nd.ni_vp); 316 return (kern_do_statfs(td, mp, buf)); 317 } 318 319 /* 320 * Get filesystem statistics. 321 */ 322 #ifndef _SYS_SYSPROTO_H_ 323 struct fstatfs_args { 324 int fd; 325 struct statfs *buf; 326 }; 327 #endif 328 int 329 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 330 { 331 struct statfs *sfp; 332 int error; 333 334 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 335 error = kern_fstatfs(td, uap->fd, sfp); 336 if (error == 0) 337 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 338 free(sfp, M_STATFS); 339 return (error); 340 } 341 342 int 343 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 344 { 345 struct file *fp; 346 struct mount *mp; 347 struct vnode *vp; 348 int error; 349 350 AUDIT_ARG_FD(fd); 351 error = getvnode(td, fd, &cap_fstatfs_rights, &fp); 352 if (error != 0) 353 return (error); 354 vp = fp->f_vnode; 355 vn_lock(vp, LK_SHARED | LK_RETRY); 356 #ifdef AUDIT 357 AUDIT_ARG_VNODE1(vp); 358 #endif 359 mp = vp->v_mount; 360 if (mp != NULL) 361 vfs_ref(mp); 362 VOP_UNLOCK(vp, 0); 363 fdrop(fp, td); 364 return (kern_do_statfs(td, mp, buf)); 365 } 366 367 /* 368 * Get statistics on all filesystems. 369 */ 370 #ifndef _SYS_SYSPROTO_H_ 371 struct getfsstat_args { 372 struct statfs *buf; 373 long bufsize; 374 int mode; 375 }; 376 #endif 377 int 378 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 379 { 380 size_t count; 381 int error; 382 383 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 384 return (EINVAL); 385 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 386 UIO_USERSPACE, uap->mode); 387 if (error == 0) 388 td->td_retval[0] = count; 389 return (error); 390 } 391 392 /* 393 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 394 * The caller is responsible for freeing memory which will be allocated 395 * in '*buf'. 396 */ 397 int 398 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 399 size_t *countp, enum uio_seg bufseg, int mode) 400 { 401 struct mount *mp, *nmp; 402 struct statfs *sfsp, *sp, *sptmp, *tofree; 403 size_t count, maxcount; 404 int error; 405 406 switch (mode) { 407 case MNT_WAIT: 408 case MNT_NOWAIT: 409 break; 410 default: 411 if (bufseg == UIO_SYSSPACE) 412 *buf = NULL; 413 return (EINVAL); 414 } 415 restart: 416 maxcount = bufsize / sizeof(struct statfs); 417 if (bufsize == 0) { 418 sfsp = NULL; 419 tofree = NULL; 420 } else if (bufseg == UIO_USERSPACE) { 421 sfsp = *buf; 422 tofree = NULL; 423 } else /* if (bufseg == UIO_SYSSPACE) */ { 424 count = 0; 425 mtx_lock(&mountlist_mtx); 426 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 427 count++; 428 } 429 mtx_unlock(&mountlist_mtx); 430 if (maxcount > count) 431 maxcount = count; 432 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 433 M_STATFS, M_WAITOK); 434 } 435 count = 0; 436 mtx_lock(&mountlist_mtx); 437 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 438 if (prison_canseemount(td->td_ucred, mp) != 0) { 439 nmp = TAILQ_NEXT(mp, mnt_list); 440 continue; 441 } 442 #ifdef MAC 443 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 444 nmp = TAILQ_NEXT(mp, mnt_list); 445 continue; 446 } 447 #endif 448 if (mode == MNT_WAIT) { 449 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 450 /* 451 * If vfs_busy() failed, and MBF_NOWAIT 452 * wasn't passed, then the mp is gone. 453 * Furthermore, because of MBF_MNTLSTLOCK, 454 * the mountlist_mtx was dropped. We have 455 * no other choice than to start over. 456 */ 457 mtx_unlock(&mountlist_mtx); 458 free(tofree, M_STATFS); 459 goto restart; 460 } 461 } else { 462 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 463 nmp = TAILQ_NEXT(mp, mnt_list); 464 continue; 465 } 466 } 467 if (sfsp != NULL && count < maxcount) { 468 sp = &mp->mnt_stat; 469 /* 470 * Set these in case the underlying filesystem 471 * fails to do so. 472 */ 473 sp->f_version = STATFS_VERSION; 474 sp->f_namemax = NAME_MAX; 475 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 476 /* 477 * If MNT_NOWAIT is specified, do not refresh 478 * the fsstat cache. 479 */ 480 if (mode != MNT_NOWAIT) { 481 error = VFS_STATFS(mp, sp); 482 if (error != 0) { 483 mtx_lock(&mountlist_mtx); 484 nmp = TAILQ_NEXT(mp, mnt_list); 485 vfs_unbusy(mp); 486 continue; 487 } 488 } 489 if (priv_check(td, PRIV_VFS_GENERATION)) { 490 sptmp = malloc(sizeof(struct statfs), M_STATFS, 491 M_WAITOK); 492 *sptmp = *sp; 493 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 494 prison_enforce_statfs(td->td_ucred, mp, sptmp); 495 sp = sptmp; 496 } else 497 sptmp = NULL; 498 if (bufseg == UIO_SYSSPACE) { 499 bcopy(sp, sfsp, sizeof(*sp)); 500 free(sptmp, M_STATFS); 501 } else /* if (bufseg == UIO_USERSPACE) */ { 502 error = copyout(sp, sfsp, sizeof(*sp)); 503 free(sptmp, M_STATFS); 504 if (error != 0) { 505 vfs_unbusy(mp); 506 return (error); 507 } 508 } 509 sfsp++; 510 } 511 count++; 512 mtx_lock(&mountlist_mtx); 513 nmp = TAILQ_NEXT(mp, mnt_list); 514 vfs_unbusy(mp); 515 } 516 mtx_unlock(&mountlist_mtx); 517 if (sfsp != NULL && count > maxcount) 518 *countp = maxcount; 519 else 520 *countp = count; 521 return (0); 522 } 523 524 #ifdef COMPAT_FREEBSD4 525 /* 526 * Get old format filesystem statistics. 527 */ 528 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 529 530 #ifndef _SYS_SYSPROTO_H_ 531 struct freebsd4_statfs_args { 532 char *path; 533 struct ostatfs *buf; 534 }; 535 #endif 536 int 537 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 538 { 539 struct ostatfs osb; 540 struct statfs *sfp; 541 int error; 542 543 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 544 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 545 if (error == 0) { 546 freebsd4_cvtstatfs(sfp, &osb); 547 error = copyout(&osb, uap->buf, sizeof(osb)); 548 } 549 free(sfp, M_STATFS); 550 return (error); 551 } 552 553 /* 554 * Get filesystem statistics. 555 */ 556 #ifndef _SYS_SYSPROTO_H_ 557 struct freebsd4_fstatfs_args { 558 int fd; 559 struct ostatfs *buf; 560 }; 561 #endif 562 int 563 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 564 { 565 struct ostatfs osb; 566 struct statfs *sfp; 567 int error; 568 569 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 570 error = kern_fstatfs(td, uap->fd, sfp); 571 if (error == 0) { 572 freebsd4_cvtstatfs(sfp, &osb); 573 error = copyout(&osb, uap->buf, sizeof(osb)); 574 } 575 free(sfp, M_STATFS); 576 return (error); 577 } 578 579 /* 580 * Get statistics on all filesystems. 581 */ 582 #ifndef _SYS_SYSPROTO_H_ 583 struct freebsd4_getfsstat_args { 584 struct ostatfs *buf; 585 long bufsize; 586 int mode; 587 }; 588 #endif 589 int 590 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 591 { 592 struct statfs *buf, *sp; 593 struct ostatfs osb; 594 size_t count, size; 595 int error; 596 597 if (uap->bufsize < 0) 598 return (EINVAL); 599 count = uap->bufsize / sizeof(struct ostatfs); 600 if (count > SIZE_MAX / sizeof(struct statfs)) 601 return (EINVAL); 602 size = count * sizeof(struct statfs); 603 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 604 uap->mode); 605 if (error == 0) 606 td->td_retval[0] = count; 607 if (size != 0) { 608 sp = buf; 609 while (count != 0 && error == 0) { 610 freebsd4_cvtstatfs(sp, &osb); 611 error = copyout(&osb, uap->buf, sizeof(osb)); 612 sp++; 613 uap->buf++; 614 count--; 615 } 616 free(buf, M_STATFS); 617 } 618 return (error); 619 } 620 621 /* 622 * Implement fstatfs() for (NFS) file handles. 623 */ 624 #ifndef _SYS_SYSPROTO_H_ 625 struct freebsd4_fhstatfs_args { 626 struct fhandle *u_fhp; 627 struct ostatfs *buf; 628 }; 629 #endif 630 int 631 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 632 { 633 struct ostatfs osb; 634 struct statfs *sfp; 635 fhandle_t fh; 636 int error; 637 638 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 639 if (error != 0) 640 return (error); 641 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 642 error = kern_fhstatfs(td, fh, sfp); 643 if (error == 0) { 644 freebsd4_cvtstatfs(sfp, &osb); 645 error = copyout(&osb, uap->buf, sizeof(osb)); 646 } 647 free(sfp, M_STATFS); 648 return (error); 649 } 650 651 /* 652 * Convert a new format statfs structure to an old format statfs structure. 653 */ 654 static void 655 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 656 { 657 658 statfs_scale_blocks(nsp, LONG_MAX); 659 bzero(osp, sizeof(*osp)); 660 osp->f_bsize = nsp->f_bsize; 661 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 662 osp->f_blocks = nsp->f_blocks; 663 osp->f_bfree = nsp->f_bfree; 664 osp->f_bavail = nsp->f_bavail; 665 osp->f_files = MIN(nsp->f_files, LONG_MAX); 666 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 667 osp->f_owner = nsp->f_owner; 668 osp->f_type = nsp->f_type; 669 osp->f_flags = nsp->f_flags; 670 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 671 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 672 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 673 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 674 strlcpy(osp->f_fstypename, nsp->f_fstypename, 675 MIN(MFSNAMELEN, OMFSNAMELEN)); 676 strlcpy(osp->f_mntonname, nsp->f_mntonname, 677 MIN(MNAMELEN, OMNAMELEN)); 678 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 679 MIN(MNAMELEN, OMNAMELEN)); 680 osp->f_fsid = nsp->f_fsid; 681 } 682 #endif /* COMPAT_FREEBSD4 */ 683 684 #if defined(COMPAT_FREEBSD11) 685 /* 686 * Get old format filesystem statistics. 687 */ 688 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 689 690 int 691 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 692 { 693 struct freebsd11_statfs osb; 694 struct statfs *sfp; 695 int error; 696 697 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 698 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 699 if (error == 0) { 700 freebsd11_cvtstatfs(sfp, &osb); 701 error = copyout(&osb, uap->buf, sizeof(osb)); 702 } 703 free(sfp, M_STATFS); 704 return (error); 705 } 706 707 /* 708 * Get filesystem statistics. 709 */ 710 int 711 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 712 { 713 struct freebsd11_statfs osb; 714 struct statfs *sfp; 715 int error; 716 717 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 718 error = kern_fstatfs(td, uap->fd, sfp); 719 if (error == 0) { 720 freebsd11_cvtstatfs(sfp, &osb); 721 error = copyout(&osb, uap->buf, sizeof(osb)); 722 } 723 free(sfp, M_STATFS); 724 return (error); 725 } 726 727 /* 728 * Get statistics on all filesystems. 729 */ 730 int 731 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 732 { 733 struct freebsd11_statfs osb; 734 struct statfs *buf, *sp; 735 size_t count, size; 736 int error; 737 738 count = uap->bufsize / sizeof(struct ostatfs); 739 size = count * sizeof(struct statfs); 740 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 741 uap->mode); 742 if (error == 0) 743 td->td_retval[0] = count; 744 if (size > 0) { 745 sp = buf; 746 while (count > 0 && error == 0) { 747 freebsd11_cvtstatfs(sp, &osb); 748 error = copyout(&osb, uap->buf, sizeof(osb)); 749 sp++; 750 uap->buf++; 751 count--; 752 } 753 free(buf, M_STATFS); 754 } 755 return (error); 756 } 757 758 /* 759 * Implement fstatfs() for (NFS) file handles. 760 */ 761 int 762 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 763 { 764 struct freebsd11_statfs osb; 765 struct statfs *sfp; 766 fhandle_t fh; 767 int error; 768 769 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 770 if (error) 771 return (error); 772 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 773 error = kern_fhstatfs(td, fh, sfp); 774 if (error == 0) { 775 freebsd11_cvtstatfs(sfp, &osb); 776 error = copyout(&osb, uap->buf, sizeof(osb)); 777 } 778 free(sfp, M_STATFS); 779 return (error); 780 } 781 782 /* 783 * Convert a new format statfs structure to an old format statfs structure. 784 */ 785 static void 786 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 787 { 788 789 bzero(osp, sizeof(*osp)); 790 osp->f_version = FREEBSD11_STATFS_VERSION; 791 osp->f_type = nsp->f_type; 792 osp->f_flags = nsp->f_flags; 793 osp->f_bsize = nsp->f_bsize; 794 osp->f_iosize = nsp->f_iosize; 795 osp->f_blocks = nsp->f_blocks; 796 osp->f_bfree = nsp->f_bfree; 797 osp->f_bavail = nsp->f_bavail; 798 osp->f_files = nsp->f_files; 799 osp->f_ffree = nsp->f_ffree; 800 osp->f_syncwrites = nsp->f_syncwrites; 801 osp->f_asyncwrites = nsp->f_asyncwrites; 802 osp->f_syncreads = nsp->f_syncreads; 803 osp->f_asyncreads = nsp->f_asyncreads; 804 osp->f_namemax = nsp->f_namemax; 805 osp->f_owner = nsp->f_owner; 806 osp->f_fsid = nsp->f_fsid; 807 strlcpy(osp->f_fstypename, nsp->f_fstypename, 808 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 809 strlcpy(osp->f_mntonname, nsp->f_mntonname, 810 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 811 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 812 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 813 } 814 #endif /* COMPAT_FREEBSD11 */ 815 816 /* 817 * Change current working directory to a given file descriptor. 818 */ 819 #ifndef _SYS_SYSPROTO_H_ 820 struct fchdir_args { 821 int fd; 822 }; 823 #endif 824 int 825 sys_fchdir(struct thread *td, struct fchdir_args *uap) 826 { 827 struct vnode *vp, *tdp; 828 struct mount *mp; 829 struct file *fp; 830 int error; 831 832 AUDIT_ARG_FD(uap->fd); 833 error = getvnode(td, uap->fd, &cap_fchdir_rights, 834 &fp); 835 if (error != 0) 836 return (error); 837 vp = fp->f_vnode; 838 vrefact(vp); 839 fdrop(fp, td); 840 vn_lock(vp, LK_SHARED | LK_RETRY); 841 AUDIT_ARG_VNODE1(vp); 842 error = change_dir(vp, td); 843 while (!error && (mp = vp->v_mountedhere) != NULL) { 844 if (vfs_busy(mp, 0)) 845 continue; 846 error = VFS_ROOT(mp, LK_SHARED, &tdp); 847 vfs_unbusy(mp); 848 if (error != 0) 849 break; 850 vput(vp); 851 vp = tdp; 852 } 853 if (error != 0) { 854 vput(vp); 855 return (error); 856 } 857 VOP_UNLOCK(vp, 0); 858 pwd_chdir(td, vp); 859 return (0); 860 } 861 862 /* 863 * Change current working directory (``.''). 864 */ 865 #ifndef _SYS_SYSPROTO_H_ 866 struct chdir_args { 867 char *path; 868 }; 869 #endif 870 int 871 sys_chdir(struct thread *td, struct chdir_args *uap) 872 { 873 874 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 875 } 876 877 int 878 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg) 879 { 880 struct nameidata nd; 881 int error; 882 883 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 884 pathseg, path, td); 885 if ((error = namei(&nd)) != 0) 886 return (error); 887 if ((error = change_dir(nd.ni_vp, td)) != 0) { 888 vput(nd.ni_vp); 889 NDFREE(&nd, NDF_ONLY_PNBUF); 890 return (error); 891 } 892 VOP_UNLOCK(nd.ni_vp, 0); 893 NDFREE(&nd, NDF_ONLY_PNBUF); 894 pwd_chdir(td, nd.ni_vp); 895 return (0); 896 } 897 898 /* 899 * Change notion of root (``/'') directory. 900 */ 901 #ifndef _SYS_SYSPROTO_H_ 902 struct chroot_args { 903 char *path; 904 }; 905 #endif 906 int 907 sys_chroot(struct thread *td, struct chroot_args *uap) 908 { 909 struct nameidata nd; 910 int error; 911 912 error = priv_check(td, PRIV_VFS_CHROOT); 913 if (error != 0) 914 return (error); 915 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 916 UIO_USERSPACE, uap->path, td); 917 error = namei(&nd); 918 if (error != 0) 919 goto error; 920 error = change_dir(nd.ni_vp, td); 921 if (error != 0) 922 goto e_vunlock; 923 #ifdef MAC 924 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 925 if (error != 0) 926 goto e_vunlock; 927 #endif 928 VOP_UNLOCK(nd.ni_vp, 0); 929 error = pwd_chroot(td, nd.ni_vp); 930 vrele(nd.ni_vp); 931 NDFREE(&nd, NDF_ONLY_PNBUF); 932 return (error); 933 e_vunlock: 934 vput(nd.ni_vp); 935 error: 936 NDFREE(&nd, NDF_ONLY_PNBUF); 937 return (error); 938 } 939 940 /* 941 * Common routine for chroot and chdir. Callers must provide a locked vnode 942 * instance. 943 */ 944 int 945 change_dir(struct vnode *vp, struct thread *td) 946 { 947 #ifdef MAC 948 int error; 949 #endif 950 951 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 952 if (vp->v_type != VDIR) 953 return (ENOTDIR); 954 #ifdef MAC 955 error = mac_vnode_check_chdir(td->td_ucred, vp); 956 if (error != 0) 957 return (error); 958 #endif 959 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 960 } 961 962 static __inline void 963 flags_to_rights(int flags, cap_rights_t *rightsp) 964 { 965 966 if (flags & O_EXEC) { 967 cap_rights_set(rightsp, CAP_FEXECVE); 968 } else { 969 switch ((flags & O_ACCMODE)) { 970 case O_RDONLY: 971 cap_rights_set(rightsp, CAP_READ); 972 break; 973 case O_RDWR: 974 cap_rights_set(rightsp, CAP_READ); 975 /* FALLTHROUGH */ 976 case O_WRONLY: 977 cap_rights_set(rightsp, CAP_WRITE); 978 if (!(flags & (O_APPEND | O_TRUNC))) 979 cap_rights_set(rightsp, CAP_SEEK); 980 break; 981 } 982 } 983 984 if (flags & O_CREAT) 985 cap_rights_set(rightsp, CAP_CREATE); 986 987 if (flags & O_TRUNC) 988 cap_rights_set(rightsp, CAP_FTRUNCATE); 989 990 if (flags & (O_SYNC | O_FSYNC)) 991 cap_rights_set(rightsp, CAP_FSYNC); 992 993 if (flags & (O_EXLOCK | O_SHLOCK)) 994 cap_rights_set(rightsp, CAP_FLOCK); 995 } 996 997 /* 998 * Check permissions, allocate an open file structure, and call the device 999 * open routine if any. 1000 */ 1001 #ifndef _SYS_SYSPROTO_H_ 1002 struct open_args { 1003 char *path; 1004 int flags; 1005 int mode; 1006 }; 1007 #endif 1008 int 1009 sys_open(struct thread *td, struct open_args *uap) 1010 { 1011 1012 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1013 uap->flags, uap->mode)); 1014 } 1015 1016 #ifndef _SYS_SYSPROTO_H_ 1017 struct openat_args { 1018 int fd; 1019 char *path; 1020 int flag; 1021 int mode; 1022 }; 1023 #endif 1024 int 1025 sys_openat(struct thread *td, struct openat_args *uap) 1026 { 1027 1028 AUDIT_ARG_FD(uap->fd); 1029 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1030 uap->mode)); 1031 } 1032 1033 int 1034 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1035 int flags, int mode) 1036 { 1037 struct proc *p = td->td_proc; 1038 struct filedesc *fdp = p->p_fd; 1039 struct file *fp; 1040 struct vnode *vp; 1041 struct nameidata nd; 1042 cap_rights_t rights; 1043 int cmode, error, indx; 1044 1045 indx = -1; 1046 1047 AUDIT_ARG_FFLAGS(flags); 1048 AUDIT_ARG_MODE(mode); 1049 cap_rights_init(&rights, CAP_LOOKUP); 1050 flags_to_rights(flags, &rights); 1051 /* 1052 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1053 * may be specified. 1054 */ 1055 if (flags & O_EXEC) { 1056 if (flags & O_ACCMODE) 1057 return (EINVAL); 1058 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1059 return (EINVAL); 1060 } else { 1061 flags = FFLAGS(flags); 1062 } 1063 1064 /* 1065 * Allocate a file structure. The descriptor to reference it 1066 * is allocated and set by finstall() below. 1067 */ 1068 error = falloc_noinstall(td, &fp); 1069 if (error != 0) 1070 return (error); 1071 /* 1072 * An extra reference on `fp' has been held for us by 1073 * falloc_noinstall(). 1074 */ 1075 /* Set the flags early so the finit in devfs can pick them up. */ 1076 fp->f_flag = flags & FMASK; 1077 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; 1078 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1079 &rights, td); 1080 td->td_dupfd = -1; /* XXX check for fdopen */ 1081 error = vn_open(&nd, &flags, cmode, fp); 1082 if (error != 0) { 1083 /* 1084 * If the vn_open replaced the method vector, something 1085 * wonderous happened deep below and we just pass it up 1086 * pretending we know what we do. 1087 */ 1088 if (error == ENXIO && fp->f_ops != &badfileops) 1089 goto success; 1090 1091 /* 1092 * Handle special fdopen() case. bleh. 1093 * 1094 * Don't do this for relative (capability) lookups; we don't 1095 * understand exactly what would happen, and we don't think 1096 * that it ever should. 1097 */ 1098 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 && 1099 (error == ENODEV || error == ENXIO) && 1100 td->td_dupfd >= 0) { 1101 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1102 &indx); 1103 if (error == 0) 1104 goto success; 1105 } 1106 1107 goto bad; 1108 } 1109 td->td_dupfd = 0; 1110 NDFREE(&nd, NDF_ONLY_PNBUF); 1111 vp = nd.ni_vp; 1112 1113 /* 1114 * Store the vnode, for any f_type. Typically, the vnode use 1115 * count is decremented by direct call to vn_closefile() for 1116 * files that switched type in the cdevsw fdopen() method. 1117 */ 1118 fp->f_vnode = vp; 1119 /* 1120 * If the file wasn't claimed by devfs bind it to the normal 1121 * vnode operations here. 1122 */ 1123 if (fp->f_ops == &badfileops) { 1124 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); 1125 fp->f_seqcount = 1; 1126 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK), 1127 DTYPE_VNODE, vp, &vnops); 1128 } 1129 1130 VOP_UNLOCK(vp, 0); 1131 if (flags & O_TRUNC) { 1132 error = fo_truncate(fp, 0, td->td_ucred, td); 1133 if (error != 0) 1134 goto bad; 1135 } 1136 success: 1137 /* 1138 * If we haven't already installed the FD (for dupfdopen), do so now. 1139 */ 1140 if (indx == -1) { 1141 struct filecaps *fcaps; 1142 1143 #ifdef CAPABILITIES 1144 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0) 1145 fcaps = &nd.ni_filecaps; 1146 else 1147 #endif 1148 fcaps = NULL; 1149 error = finstall(td, fp, &indx, flags, fcaps); 1150 /* On success finstall() consumes fcaps. */ 1151 if (error != 0) { 1152 filecaps_free(&nd.ni_filecaps); 1153 goto bad; 1154 } 1155 } else { 1156 filecaps_free(&nd.ni_filecaps); 1157 } 1158 1159 /* 1160 * Release our private reference, leaving the one associated with 1161 * the descriptor table intact. 1162 */ 1163 fdrop(fp, td); 1164 td->td_retval[0] = indx; 1165 return (0); 1166 bad: 1167 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1168 fdrop(fp, td); 1169 return (error); 1170 } 1171 1172 #ifdef COMPAT_43 1173 /* 1174 * Create a file. 1175 */ 1176 #ifndef _SYS_SYSPROTO_H_ 1177 struct ocreat_args { 1178 char *path; 1179 int mode; 1180 }; 1181 #endif 1182 int 1183 ocreat(struct thread *td, struct ocreat_args *uap) 1184 { 1185 1186 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1187 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1188 } 1189 #endif /* COMPAT_43 */ 1190 1191 /* 1192 * Create a special file. 1193 */ 1194 #ifndef _SYS_SYSPROTO_H_ 1195 struct mknodat_args { 1196 int fd; 1197 char *path; 1198 mode_t mode; 1199 dev_t dev; 1200 }; 1201 #endif 1202 int 1203 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1204 { 1205 1206 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1207 uap->dev)); 1208 } 1209 1210 #if defined(COMPAT_FREEBSD11) 1211 int 1212 freebsd11_mknod(struct thread *td, 1213 struct freebsd11_mknod_args *uap) 1214 { 1215 1216 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1217 uap->mode, uap->dev)); 1218 } 1219 1220 int 1221 freebsd11_mknodat(struct thread *td, 1222 struct freebsd11_mknodat_args *uap) 1223 { 1224 1225 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1226 uap->dev)); 1227 } 1228 #endif /* COMPAT_FREEBSD11 */ 1229 1230 int 1231 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1232 int mode, dev_t dev) 1233 { 1234 struct vnode *vp; 1235 struct mount *mp; 1236 struct vattr vattr; 1237 struct nameidata nd; 1238 int error, whiteout = 0; 1239 1240 AUDIT_ARG_MODE(mode); 1241 AUDIT_ARG_DEV(dev); 1242 switch (mode & S_IFMT) { 1243 case S_IFCHR: 1244 case S_IFBLK: 1245 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1246 if (error == 0 && dev == VNOVAL) 1247 error = EINVAL; 1248 break; 1249 case S_IFWHT: 1250 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1251 break; 1252 case S_IFIFO: 1253 if (dev == 0) 1254 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1255 /* FALLTHROUGH */ 1256 default: 1257 error = EINVAL; 1258 break; 1259 } 1260 if (error != 0) 1261 return (error); 1262 restart: 1263 bwillwrite(); 1264 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1265 NOCACHE, pathseg, path, fd, &cap_mknodat_rights, 1266 td); 1267 if ((error = namei(&nd)) != 0) 1268 return (error); 1269 vp = nd.ni_vp; 1270 if (vp != NULL) { 1271 NDFREE(&nd, NDF_ONLY_PNBUF); 1272 if (vp == nd.ni_dvp) 1273 vrele(nd.ni_dvp); 1274 else 1275 vput(nd.ni_dvp); 1276 vrele(vp); 1277 return (EEXIST); 1278 } else { 1279 VATTR_NULL(&vattr); 1280 vattr.va_mode = (mode & ALLPERMS) & 1281 ~td->td_proc->p_fd->fd_cmask; 1282 vattr.va_rdev = dev; 1283 whiteout = 0; 1284 1285 switch (mode & S_IFMT) { 1286 case S_IFCHR: 1287 vattr.va_type = VCHR; 1288 break; 1289 case S_IFBLK: 1290 vattr.va_type = VBLK; 1291 break; 1292 case S_IFWHT: 1293 whiteout = 1; 1294 break; 1295 default: 1296 panic("kern_mknod: invalid mode"); 1297 } 1298 } 1299 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1300 NDFREE(&nd, NDF_ONLY_PNBUF); 1301 vput(nd.ni_dvp); 1302 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1303 return (error); 1304 goto restart; 1305 } 1306 #ifdef MAC 1307 if (error == 0 && !whiteout) 1308 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1309 &nd.ni_cnd, &vattr); 1310 #endif 1311 if (error == 0) { 1312 if (whiteout) 1313 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1314 else { 1315 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1316 &nd.ni_cnd, &vattr); 1317 if (error == 0) 1318 vput(nd.ni_vp); 1319 } 1320 } 1321 NDFREE(&nd, NDF_ONLY_PNBUF); 1322 vput(nd.ni_dvp); 1323 vn_finished_write(mp); 1324 return (error); 1325 } 1326 1327 /* 1328 * Create a named pipe. 1329 */ 1330 #ifndef _SYS_SYSPROTO_H_ 1331 struct mkfifo_args { 1332 char *path; 1333 int mode; 1334 }; 1335 #endif 1336 int 1337 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1338 { 1339 1340 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1341 uap->mode)); 1342 } 1343 1344 #ifndef _SYS_SYSPROTO_H_ 1345 struct mkfifoat_args { 1346 int fd; 1347 char *path; 1348 mode_t mode; 1349 }; 1350 #endif 1351 int 1352 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1353 { 1354 1355 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1356 uap->mode)); 1357 } 1358 1359 int 1360 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1361 int mode) 1362 { 1363 struct mount *mp; 1364 struct vattr vattr; 1365 struct nameidata nd; 1366 int error; 1367 1368 AUDIT_ARG_MODE(mode); 1369 restart: 1370 bwillwrite(); 1371 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1372 NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, 1373 td); 1374 if ((error = namei(&nd)) != 0) 1375 return (error); 1376 if (nd.ni_vp != NULL) { 1377 NDFREE(&nd, NDF_ONLY_PNBUF); 1378 if (nd.ni_vp == nd.ni_dvp) 1379 vrele(nd.ni_dvp); 1380 else 1381 vput(nd.ni_dvp); 1382 vrele(nd.ni_vp); 1383 return (EEXIST); 1384 } 1385 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1386 NDFREE(&nd, NDF_ONLY_PNBUF); 1387 vput(nd.ni_dvp); 1388 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1389 return (error); 1390 goto restart; 1391 } 1392 VATTR_NULL(&vattr); 1393 vattr.va_type = VFIFO; 1394 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1395 #ifdef MAC 1396 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1397 &vattr); 1398 if (error != 0) 1399 goto out; 1400 #endif 1401 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1402 if (error == 0) 1403 vput(nd.ni_vp); 1404 #ifdef MAC 1405 out: 1406 #endif 1407 vput(nd.ni_dvp); 1408 vn_finished_write(mp); 1409 NDFREE(&nd, NDF_ONLY_PNBUF); 1410 return (error); 1411 } 1412 1413 /* 1414 * Make a hard file link. 1415 */ 1416 #ifndef _SYS_SYSPROTO_H_ 1417 struct link_args { 1418 char *path; 1419 char *link; 1420 }; 1421 #endif 1422 int 1423 sys_link(struct thread *td, struct link_args *uap) 1424 { 1425 1426 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1427 UIO_USERSPACE, FOLLOW)); 1428 } 1429 1430 #ifndef _SYS_SYSPROTO_H_ 1431 struct linkat_args { 1432 int fd1; 1433 char *path1; 1434 int fd2; 1435 char *path2; 1436 int flag; 1437 }; 1438 #endif 1439 int 1440 sys_linkat(struct thread *td, struct linkat_args *uap) 1441 { 1442 int flag; 1443 1444 flag = uap->flag; 1445 if (flag & ~AT_SYMLINK_FOLLOW) 1446 return (EINVAL); 1447 1448 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1449 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW)); 1450 } 1451 1452 int hardlink_check_uid = 0; 1453 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1454 &hardlink_check_uid, 0, 1455 "Unprivileged processes cannot create hard links to files owned by other " 1456 "users"); 1457 static int hardlink_check_gid = 0; 1458 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1459 &hardlink_check_gid, 0, 1460 "Unprivileged processes cannot create hard links to files owned by other " 1461 "groups"); 1462 1463 static int 1464 can_hardlink(struct vnode *vp, struct ucred *cred) 1465 { 1466 struct vattr va; 1467 int error; 1468 1469 if (!hardlink_check_uid && !hardlink_check_gid) 1470 return (0); 1471 1472 error = VOP_GETATTR(vp, &va, cred); 1473 if (error != 0) 1474 return (error); 1475 1476 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1477 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1478 if (error != 0) 1479 return (error); 1480 } 1481 1482 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1483 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1484 if (error != 0) 1485 return (error); 1486 } 1487 1488 return (0); 1489 } 1490 1491 int 1492 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2, 1493 enum uio_seg segflg, int follow) 1494 { 1495 struct vnode *vp; 1496 struct mount *mp; 1497 struct nameidata nd; 1498 int error; 1499 1500 again: 1501 bwillwrite(); 1502 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflg, path1, fd1, 1503 &cap_linkat_source_rights, td); 1504 1505 if ((error = namei(&nd)) != 0) 1506 return (error); 1507 NDFREE(&nd, NDF_ONLY_PNBUF); 1508 vp = nd.ni_vp; 1509 if (vp->v_type == VDIR) { 1510 vrele(vp); 1511 return (EPERM); /* POSIX */ 1512 } 1513 NDINIT_ATRIGHTS(&nd, CREATE, 1514 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflg, path2, fd2, 1515 &cap_linkat_target_rights, td); 1516 if ((error = namei(&nd)) == 0) { 1517 if (nd.ni_vp != NULL) { 1518 NDFREE(&nd, NDF_ONLY_PNBUF); 1519 if (nd.ni_dvp == nd.ni_vp) 1520 vrele(nd.ni_dvp); 1521 else 1522 vput(nd.ni_dvp); 1523 vrele(nd.ni_vp); 1524 vrele(vp); 1525 return (EEXIST); 1526 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1527 /* 1528 * Cross-device link. No need to recheck 1529 * vp->v_type, since it cannot change, except 1530 * to VBAD. 1531 */ 1532 NDFREE(&nd, NDF_ONLY_PNBUF); 1533 vput(nd.ni_dvp); 1534 vrele(vp); 1535 return (EXDEV); 1536 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1537 error = can_hardlink(vp, td->td_ucred); 1538 #ifdef MAC 1539 if (error == 0) 1540 error = mac_vnode_check_link(td->td_ucred, 1541 nd.ni_dvp, vp, &nd.ni_cnd); 1542 #endif 1543 if (error != 0) { 1544 vput(vp); 1545 vput(nd.ni_dvp); 1546 NDFREE(&nd, NDF_ONLY_PNBUF); 1547 return (error); 1548 } 1549 error = vn_start_write(vp, &mp, V_NOWAIT); 1550 if (error != 0) { 1551 vput(vp); 1552 vput(nd.ni_dvp); 1553 NDFREE(&nd, NDF_ONLY_PNBUF); 1554 error = vn_start_write(NULL, &mp, 1555 V_XSLEEP | PCATCH); 1556 if (error != 0) 1557 return (error); 1558 goto again; 1559 } 1560 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1561 VOP_UNLOCK(vp, 0); 1562 vput(nd.ni_dvp); 1563 vn_finished_write(mp); 1564 NDFREE(&nd, NDF_ONLY_PNBUF); 1565 } else { 1566 vput(nd.ni_dvp); 1567 NDFREE(&nd, NDF_ONLY_PNBUF); 1568 vrele(vp); 1569 goto again; 1570 } 1571 } 1572 vrele(vp); 1573 return (error); 1574 } 1575 1576 /* 1577 * Make a symbolic link. 1578 */ 1579 #ifndef _SYS_SYSPROTO_H_ 1580 struct symlink_args { 1581 char *path; 1582 char *link; 1583 }; 1584 #endif 1585 int 1586 sys_symlink(struct thread *td, struct symlink_args *uap) 1587 { 1588 1589 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1590 UIO_USERSPACE)); 1591 } 1592 1593 #ifndef _SYS_SYSPROTO_H_ 1594 struct symlinkat_args { 1595 char *path; 1596 int fd; 1597 char *path2; 1598 }; 1599 #endif 1600 int 1601 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1602 { 1603 1604 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1605 UIO_USERSPACE)); 1606 } 1607 1608 int 1609 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2, 1610 enum uio_seg segflg) 1611 { 1612 struct mount *mp; 1613 struct vattr vattr; 1614 char *syspath; 1615 struct nameidata nd; 1616 int error; 1617 1618 if (segflg == UIO_SYSSPACE) { 1619 syspath = path1; 1620 } else { 1621 syspath = uma_zalloc(namei_zone, M_WAITOK); 1622 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0) 1623 goto out; 1624 } 1625 AUDIT_ARG_TEXT(syspath); 1626 restart: 1627 bwillwrite(); 1628 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1629 NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, 1630 td); 1631 if ((error = namei(&nd)) != 0) 1632 goto out; 1633 if (nd.ni_vp) { 1634 NDFREE(&nd, NDF_ONLY_PNBUF); 1635 if (nd.ni_vp == nd.ni_dvp) 1636 vrele(nd.ni_dvp); 1637 else 1638 vput(nd.ni_dvp); 1639 vrele(nd.ni_vp); 1640 error = EEXIST; 1641 goto out; 1642 } 1643 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1644 NDFREE(&nd, NDF_ONLY_PNBUF); 1645 vput(nd.ni_dvp); 1646 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1647 goto out; 1648 goto restart; 1649 } 1650 VATTR_NULL(&vattr); 1651 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1652 #ifdef MAC 1653 vattr.va_type = VLNK; 1654 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1655 &vattr); 1656 if (error != 0) 1657 goto out2; 1658 #endif 1659 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1660 if (error == 0) 1661 vput(nd.ni_vp); 1662 #ifdef MAC 1663 out2: 1664 #endif 1665 NDFREE(&nd, NDF_ONLY_PNBUF); 1666 vput(nd.ni_dvp); 1667 vn_finished_write(mp); 1668 out: 1669 if (segflg != UIO_SYSSPACE) 1670 uma_zfree(namei_zone, syspath); 1671 return (error); 1672 } 1673 1674 /* 1675 * Delete a whiteout from the filesystem. 1676 */ 1677 #ifndef _SYS_SYSPROTO_H_ 1678 struct undelete_args { 1679 char *path; 1680 }; 1681 #endif 1682 int 1683 sys_undelete(struct thread *td, struct undelete_args *uap) 1684 { 1685 struct mount *mp; 1686 struct nameidata nd; 1687 int error; 1688 1689 restart: 1690 bwillwrite(); 1691 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1692 UIO_USERSPACE, uap->path, td); 1693 error = namei(&nd); 1694 if (error != 0) 1695 return (error); 1696 1697 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1698 NDFREE(&nd, NDF_ONLY_PNBUF); 1699 if (nd.ni_vp == nd.ni_dvp) 1700 vrele(nd.ni_dvp); 1701 else 1702 vput(nd.ni_dvp); 1703 if (nd.ni_vp) 1704 vrele(nd.ni_vp); 1705 return (EEXIST); 1706 } 1707 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1708 NDFREE(&nd, NDF_ONLY_PNBUF); 1709 vput(nd.ni_dvp); 1710 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1711 return (error); 1712 goto restart; 1713 } 1714 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1715 NDFREE(&nd, NDF_ONLY_PNBUF); 1716 vput(nd.ni_dvp); 1717 vn_finished_write(mp); 1718 return (error); 1719 } 1720 1721 /* 1722 * Delete a name from the filesystem. 1723 */ 1724 #ifndef _SYS_SYSPROTO_H_ 1725 struct unlink_args { 1726 char *path; 1727 }; 1728 #endif 1729 int 1730 sys_unlink(struct thread *td, struct unlink_args *uap) 1731 { 1732 1733 return (kern_unlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0)); 1734 } 1735 1736 #ifndef _SYS_SYSPROTO_H_ 1737 struct unlinkat_args { 1738 int fd; 1739 char *path; 1740 int flag; 1741 }; 1742 #endif 1743 int 1744 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1745 { 1746 int flag = uap->flag; 1747 int fd = uap->fd; 1748 char *path = uap->path; 1749 1750 if (flag & ~AT_REMOVEDIR) 1751 return (EINVAL); 1752 1753 if (flag & AT_REMOVEDIR) 1754 return (kern_rmdirat(td, fd, path, UIO_USERSPACE)); 1755 else 1756 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0)); 1757 } 1758 1759 int 1760 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1761 ino_t oldinum) 1762 { 1763 struct mount *mp; 1764 struct vnode *vp; 1765 struct nameidata nd; 1766 struct stat sb; 1767 int error; 1768 1769 restart: 1770 bwillwrite(); 1771 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, 1772 pathseg, path, fd, &cap_unlinkat_rights, td); 1773 if ((error = namei(&nd)) != 0) 1774 return (error == EINVAL ? EPERM : error); 1775 vp = nd.ni_vp; 1776 if (vp->v_type == VDIR && oldinum == 0) { 1777 error = EPERM; /* POSIX */ 1778 } else if (oldinum != 0 && 1779 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1780 sb.st_ino != oldinum) { 1781 error = EIDRM; /* Identifier removed */ 1782 } else { 1783 /* 1784 * The root of a mounted filesystem cannot be deleted. 1785 * 1786 * XXX: can this only be a VDIR case? 1787 */ 1788 if (vp->v_vflag & VV_ROOT) 1789 error = EBUSY; 1790 } 1791 if (error == 0) { 1792 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1793 NDFREE(&nd, NDF_ONLY_PNBUF); 1794 vput(nd.ni_dvp); 1795 if (vp == nd.ni_dvp) 1796 vrele(vp); 1797 else 1798 vput(vp); 1799 if ((error = vn_start_write(NULL, &mp, 1800 V_XSLEEP | PCATCH)) != 0) 1801 return (error); 1802 goto restart; 1803 } 1804 #ifdef MAC 1805 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1806 &nd.ni_cnd); 1807 if (error != 0) 1808 goto out; 1809 #endif 1810 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1811 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1812 #ifdef MAC 1813 out: 1814 #endif 1815 vn_finished_write(mp); 1816 } 1817 NDFREE(&nd, NDF_ONLY_PNBUF); 1818 vput(nd.ni_dvp); 1819 if (vp == nd.ni_dvp) 1820 vrele(vp); 1821 else 1822 vput(vp); 1823 return (error); 1824 } 1825 1826 /* 1827 * Reposition read/write file offset. 1828 */ 1829 #ifndef _SYS_SYSPROTO_H_ 1830 struct lseek_args { 1831 int fd; 1832 int pad; 1833 off_t offset; 1834 int whence; 1835 }; 1836 #endif 1837 int 1838 sys_lseek(struct thread *td, struct lseek_args *uap) 1839 { 1840 1841 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1842 } 1843 1844 int 1845 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1846 { 1847 struct file *fp; 1848 int error; 1849 1850 AUDIT_ARG_FD(fd); 1851 error = fget(td, fd, &cap_seek_rights, &fp); 1852 if (error != 0) 1853 return (error); 1854 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1855 fo_seek(fp, offset, whence, td) : ESPIPE; 1856 fdrop(fp, td); 1857 return (error); 1858 } 1859 1860 #if defined(COMPAT_43) 1861 /* 1862 * Reposition read/write file offset. 1863 */ 1864 #ifndef _SYS_SYSPROTO_H_ 1865 struct olseek_args { 1866 int fd; 1867 long offset; 1868 int whence; 1869 }; 1870 #endif 1871 int 1872 olseek(struct thread *td, struct olseek_args *uap) 1873 { 1874 1875 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1876 } 1877 #endif /* COMPAT_43 */ 1878 1879 #if defined(COMPAT_FREEBSD6) 1880 /* Version with the 'pad' argument */ 1881 int 1882 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 1883 { 1884 1885 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1886 } 1887 #endif 1888 1889 /* 1890 * Check access permissions using passed credentials. 1891 */ 1892 static int 1893 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 1894 struct thread *td) 1895 { 1896 accmode_t accmode; 1897 int error; 1898 1899 /* Flags == 0 means only check for existence. */ 1900 if (user_flags == 0) 1901 return (0); 1902 1903 accmode = 0; 1904 if (user_flags & R_OK) 1905 accmode |= VREAD; 1906 if (user_flags & W_OK) 1907 accmode |= VWRITE; 1908 if (user_flags & X_OK) 1909 accmode |= VEXEC; 1910 #ifdef MAC 1911 error = mac_vnode_check_access(cred, vp, accmode); 1912 if (error != 0) 1913 return (error); 1914 #endif 1915 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1916 error = VOP_ACCESS(vp, accmode, cred, td); 1917 return (error); 1918 } 1919 1920 /* 1921 * Check access permissions using "real" credentials. 1922 */ 1923 #ifndef _SYS_SYSPROTO_H_ 1924 struct access_args { 1925 char *path; 1926 int amode; 1927 }; 1928 #endif 1929 int 1930 sys_access(struct thread *td, struct access_args *uap) 1931 { 1932 1933 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1934 0, uap->amode)); 1935 } 1936 1937 #ifndef _SYS_SYSPROTO_H_ 1938 struct faccessat_args { 1939 int dirfd; 1940 char *path; 1941 int amode; 1942 int flag; 1943 } 1944 #endif 1945 int 1946 sys_faccessat(struct thread *td, struct faccessat_args *uap) 1947 { 1948 1949 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1950 uap->amode)); 1951 } 1952 1953 int 1954 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1955 int flag, int amode) 1956 { 1957 struct ucred *cred, *usecred; 1958 struct vnode *vp; 1959 struct nameidata nd; 1960 int error; 1961 1962 if (flag & ~AT_EACCESS) 1963 return (EINVAL); 1964 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 1965 return (EINVAL); 1966 1967 /* 1968 * Create and modify a temporary credential instead of one that 1969 * is potentially shared (if we need one). 1970 */ 1971 cred = td->td_ucred; 1972 if ((flag & AT_EACCESS) == 0 && 1973 ((cred->cr_uid != cred->cr_ruid || 1974 cred->cr_rgid != cred->cr_groups[0]))) { 1975 usecred = crdup(cred); 1976 usecred->cr_uid = cred->cr_ruid; 1977 usecred->cr_groups[0] = cred->cr_rgid; 1978 td->td_ucred = usecred; 1979 } else 1980 usecred = cred; 1981 AUDIT_ARG_VALUE(amode); 1982 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 1983 AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, 1984 td); 1985 if ((error = namei(&nd)) != 0) 1986 goto out; 1987 vp = nd.ni_vp; 1988 1989 error = vn_access(vp, amode, usecred, td); 1990 NDFREE(&nd, NDF_ONLY_PNBUF); 1991 vput(vp); 1992 out: 1993 if (usecred != cred) { 1994 td->td_ucred = cred; 1995 crfree(usecred); 1996 } 1997 return (error); 1998 } 1999 2000 /* 2001 * Check access permissions using "effective" credentials. 2002 */ 2003 #ifndef _SYS_SYSPROTO_H_ 2004 struct eaccess_args { 2005 char *path; 2006 int amode; 2007 }; 2008 #endif 2009 int 2010 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2011 { 2012 2013 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2014 AT_EACCESS, uap->amode)); 2015 } 2016 2017 #if defined(COMPAT_43) 2018 /* 2019 * Get file status; this version follows links. 2020 */ 2021 #ifndef _SYS_SYSPROTO_H_ 2022 struct ostat_args { 2023 char *path; 2024 struct ostat *ub; 2025 }; 2026 #endif 2027 int 2028 ostat(struct thread *td, struct ostat_args *uap) 2029 { 2030 struct stat sb; 2031 struct ostat osb; 2032 int error; 2033 2034 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2035 &sb, NULL); 2036 if (error != 0) 2037 return (error); 2038 cvtstat(&sb, &osb); 2039 return (copyout(&osb, uap->ub, sizeof (osb))); 2040 } 2041 2042 /* 2043 * Get file status; this version does not follow links. 2044 */ 2045 #ifndef _SYS_SYSPROTO_H_ 2046 struct olstat_args { 2047 char *path; 2048 struct ostat *ub; 2049 }; 2050 #endif 2051 int 2052 olstat(struct thread *td, struct olstat_args *uap) 2053 { 2054 struct stat sb; 2055 struct ostat osb; 2056 int error; 2057 2058 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2059 UIO_USERSPACE, &sb, NULL); 2060 if (error != 0) 2061 return (error); 2062 cvtstat(&sb, &osb); 2063 return (copyout(&osb, uap->ub, sizeof (osb))); 2064 } 2065 2066 /* 2067 * Convert from an old to a new stat structure. 2068 * XXX: many values are blindly truncated. 2069 */ 2070 void 2071 cvtstat(struct stat *st, struct ostat *ost) 2072 { 2073 2074 bzero(ost, sizeof(*ost)); 2075 ost->st_dev = st->st_dev; 2076 ost->st_ino = st->st_ino; 2077 ost->st_mode = st->st_mode; 2078 ost->st_nlink = st->st_nlink; 2079 ost->st_uid = st->st_uid; 2080 ost->st_gid = st->st_gid; 2081 ost->st_rdev = st->st_rdev; 2082 ost->st_size = MIN(st->st_size, INT32_MAX); 2083 ost->st_atim = st->st_atim; 2084 ost->st_mtim = st->st_mtim; 2085 ost->st_ctim = st->st_ctim; 2086 ost->st_blksize = st->st_blksize; 2087 ost->st_blocks = st->st_blocks; 2088 ost->st_flags = st->st_flags; 2089 ost->st_gen = st->st_gen; 2090 } 2091 #endif /* COMPAT_43 */ 2092 2093 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2094 int ino64_trunc_error; 2095 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2096 &ino64_trunc_error, 0, 2097 "Error on truncation of device, file or inode number, or link count"); 2098 2099 int 2100 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2101 { 2102 2103 ost->st_dev = st->st_dev; 2104 if (ost->st_dev != st->st_dev) { 2105 switch (ino64_trunc_error) { 2106 default: 2107 /* 2108 * Since dev_t is almost raw, don't clamp to the 2109 * maximum for case 2, but ignore the error. 2110 */ 2111 break; 2112 case 1: 2113 return (EOVERFLOW); 2114 } 2115 } 2116 ost->st_ino = st->st_ino; 2117 if (ost->st_ino != st->st_ino) { 2118 switch (ino64_trunc_error) { 2119 default: 2120 case 0: 2121 break; 2122 case 1: 2123 return (EOVERFLOW); 2124 case 2: 2125 ost->st_ino = UINT32_MAX; 2126 break; 2127 } 2128 } 2129 ost->st_mode = st->st_mode; 2130 ost->st_nlink = st->st_nlink; 2131 if (ost->st_nlink != st->st_nlink) { 2132 switch (ino64_trunc_error) { 2133 default: 2134 case 0: 2135 break; 2136 case 1: 2137 return (EOVERFLOW); 2138 case 2: 2139 ost->st_nlink = UINT16_MAX; 2140 break; 2141 } 2142 } 2143 ost->st_uid = st->st_uid; 2144 ost->st_gid = st->st_gid; 2145 ost->st_rdev = st->st_rdev; 2146 if (ost->st_rdev != st->st_rdev) { 2147 switch (ino64_trunc_error) { 2148 default: 2149 break; 2150 case 1: 2151 return (EOVERFLOW); 2152 } 2153 } 2154 ost->st_atim = st->st_atim; 2155 ost->st_mtim = st->st_mtim; 2156 ost->st_ctim = st->st_ctim; 2157 ost->st_size = st->st_size; 2158 ost->st_blocks = st->st_blocks; 2159 ost->st_blksize = st->st_blksize; 2160 ost->st_flags = st->st_flags; 2161 ost->st_gen = st->st_gen; 2162 ost->st_lspare = 0; 2163 ost->st_birthtim = st->st_birthtim; 2164 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2165 sizeof(*ost) - offsetof(struct freebsd11_stat, 2166 st_birthtim) - sizeof(ost->st_birthtim)); 2167 return (0); 2168 } 2169 2170 int 2171 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2172 { 2173 struct stat sb; 2174 struct freebsd11_stat osb; 2175 int error; 2176 2177 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2178 &sb, NULL); 2179 if (error != 0) 2180 return (error); 2181 error = freebsd11_cvtstat(&sb, &osb); 2182 if (error == 0) 2183 error = copyout(&osb, uap->ub, sizeof(osb)); 2184 return (error); 2185 } 2186 2187 int 2188 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2189 { 2190 struct stat sb; 2191 struct freebsd11_stat osb; 2192 int error; 2193 2194 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2195 UIO_USERSPACE, &sb, NULL); 2196 if (error != 0) 2197 return (error); 2198 error = freebsd11_cvtstat(&sb, &osb); 2199 if (error == 0) 2200 error = copyout(&osb, uap->ub, sizeof(osb)); 2201 return (error); 2202 } 2203 2204 int 2205 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2206 { 2207 struct fhandle fh; 2208 struct stat sb; 2209 struct freebsd11_stat osb; 2210 int error; 2211 2212 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2213 if (error != 0) 2214 return (error); 2215 error = kern_fhstat(td, fh, &sb); 2216 if (error != 0) 2217 return (error); 2218 error = freebsd11_cvtstat(&sb, &osb); 2219 if (error == 0) 2220 error = copyout(&osb, uap->sb, sizeof(osb)); 2221 return (error); 2222 } 2223 2224 int 2225 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2226 { 2227 struct stat sb; 2228 struct freebsd11_stat osb; 2229 int error; 2230 2231 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2232 UIO_USERSPACE, &sb, NULL); 2233 if (error != 0) 2234 return (error); 2235 error = freebsd11_cvtstat(&sb, &osb); 2236 if (error == 0) 2237 error = copyout(&osb, uap->buf, sizeof(osb)); 2238 return (error); 2239 } 2240 #endif /* COMPAT_FREEBSD11 */ 2241 2242 /* 2243 * Get file status 2244 */ 2245 #ifndef _SYS_SYSPROTO_H_ 2246 struct fstatat_args { 2247 int fd; 2248 char *path; 2249 struct stat *buf; 2250 int flag; 2251 } 2252 #endif 2253 int 2254 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2255 { 2256 struct stat sb; 2257 int error; 2258 2259 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2260 UIO_USERSPACE, &sb, NULL); 2261 if (error == 0) 2262 error = copyout(&sb, uap->buf, sizeof (sb)); 2263 return (error); 2264 } 2265 2266 int 2267 kern_statat(struct thread *td, int flag, int fd, char *path, 2268 enum uio_seg pathseg, struct stat *sbp, 2269 void (*hook)(struct vnode *vp, struct stat *sbp)) 2270 { 2271 struct nameidata nd; 2272 struct stat sb; 2273 int error; 2274 2275 if (flag & ~AT_SYMLINK_NOFOLLOW) 2276 return (EINVAL); 2277 2278 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 2279 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd, 2280 &cap_fstat_rights, td); 2281 2282 if ((error = namei(&nd)) != 0) 2283 return (error); 2284 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 2285 if (error == 0) { 2286 SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode); 2287 if (S_ISREG(sb.st_mode)) 2288 SDT_PROBE2(vfs, , stat, reg, path, pathseg); 2289 if (__predict_false(hook != NULL)) 2290 hook(nd.ni_vp, &sb); 2291 } 2292 NDFREE(&nd, NDF_ONLY_PNBUF); 2293 vput(nd.ni_vp); 2294 if (error != 0) 2295 return (error); 2296 #ifdef __STAT_TIME_T_EXT 2297 sb.st_atim_ext = 0; 2298 sb.st_mtim_ext = 0; 2299 sb.st_ctim_ext = 0; 2300 sb.st_btim_ext = 0; 2301 #endif 2302 *sbp = sb; 2303 #ifdef KTRACE 2304 if (KTRPOINT(td, KTR_STRUCT)) 2305 ktrstat(&sb); 2306 #endif 2307 return (0); 2308 } 2309 2310 #if defined(COMPAT_FREEBSD11) 2311 /* 2312 * Implementation of the NetBSD [l]stat() functions. 2313 */ 2314 void 2315 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2316 { 2317 2318 bzero(nsb, sizeof(*nsb)); 2319 nsb->st_dev = sb->st_dev; 2320 nsb->st_ino = sb->st_ino; 2321 nsb->st_mode = sb->st_mode; 2322 nsb->st_nlink = sb->st_nlink; 2323 nsb->st_uid = sb->st_uid; 2324 nsb->st_gid = sb->st_gid; 2325 nsb->st_rdev = sb->st_rdev; 2326 nsb->st_atim = sb->st_atim; 2327 nsb->st_mtim = sb->st_mtim; 2328 nsb->st_ctim = sb->st_ctim; 2329 nsb->st_size = sb->st_size; 2330 nsb->st_blocks = sb->st_blocks; 2331 nsb->st_blksize = sb->st_blksize; 2332 nsb->st_flags = sb->st_flags; 2333 nsb->st_gen = sb->st_gen; 2334 nsb->st_birthtim = sb->st_birthtim; 2335 } 2336 2337 #ifndef _SYS_SYSPROTO_H_ 2338 struct freebsd11_nstat_args { 2339 char *path; 2340 struct nstat *ub; 2341 }; 2342 #endif 2343 int 2344 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2345 { 2346 struct stat sb; 2347 struct nstat nsb; 2348 int error; 2349 2350 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2351 &sb, NULL); 2352 if (error != 0) 2353 return (error); 2354 freebsd11_cvtnstat(&sb, &nsb); 2355 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2356 } 2357 2358 /* 2359 * NetBSD lstat. Get file status; this version does not follow links. 2360 */ 2361 #ifndef _SYS_SYSPROTO_H_ 2362 struct freebsd11_nlstat_args { 2363 char *path; 2364 struct nstat *ub; 2365 }; 2366 #endif 2367 int 2368 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2369 { 2370 struct stat sb; 2371 struct nstat nsb; 2372 int error; 2373 2374 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2375 UIO_USERSPACE, &sb, NULL); 2376 if (error != 0) 2377 return (error); 2378 freebsd11_cvtnstat(&sb, &nsb); 2379 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2380 } 2381 #endif /* COMPAT_FREEBSD11 */ 2382 2383 /* 2384 * Get configurable pathname variables. 2385 */ 2386 #ifndef _SYS_SYSPROTO_H_ 2387 struct pathconf_args { 2388 char *path; 2389 int name; 2390 }; 2391 #endif 2392 int 2393 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2394 { 2395 long value; 2396 int error; 2397 2398 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2399 &value); 2400 if (error == 0) 2401 td->td_retval[0] = value; 2402 return (error); 2403 } 2404 2405 #ifndef _SYS_SYSPROTO_H_ 2406 struct lpathconf_args { 2407 char *path; 2408 int name; 2409 }; 2410 #endif 2411 int 2412 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2413 { 2414 long value; 2415 int error; 2416 2417 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2418 NOFOLLOW, &value); 2419 if (error == 0) 2420 td->td_retval[0] = value; 2421 return (error); 2422 } 2423 2424 int 2425 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name, 2426 u_long flags, long *valuep) 2427 { 2428 struct nameidata nd; 2429 int error; 2430 2431 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2432 pathseg, path, td); 2433 if ((error = namei(&nd)) != 0) 2434 return (error); 2435 NDFREE(&nd, NDF_ONLY_PNBUF); 2436 2437 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2438 vput(nd.ni_vp); 2439 return (error); 2440 } 2441 2442 /* 2443 * Return target name of a symbolic link. 2444 */ 2445 #ifndef _SYS_SYSPROTO_H_ 2446 struct readlink_args { 2447 char *path; 2448 char *buf; 2449 size_t count; 2450 }; 2451 #endif 2452 int 2453 sys_readlink(struct thread *td, struct readlink_args *uap) 2454 { 2455 2456 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2457 uap->buf, UIO_USERSPACE, uap->count)); 2458 } 2459 #ifndef _SYS_SYSPROTO_H_ 2460 struct readlinkat_args { 2461 int fd; 2462 char *path; 2463 char *buf; 2464 size_t bufsize; 2465 }; 2466 #endif 2467 int 2468 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2469 { 2470 2471 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2472 uap->buf, UIO_USERSPACE, uap->bufsize)); 2473 } 2474 2475 int 2476 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2477 char *buf, enum uio_seg bufseg, size_t count) 2478 { 2479 struct vnode *vp; 2480 struct iovec aiov; 2481 struct uio auio; 2482 struct nameidata nd; 2483 int error; 2484 2485 if (count > IOSIZE_MAX) 2486 return (EINVAL); 2487 2488 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2489 pathseg, path, fd, td); 2490 2491 if ((error = namei(&nd)) != 0) 2492 return (error); 2493 NDFREE(&nd, NDF_ONLY_PNBUF); 2494 vp = nd.ni_vp; 2495 #ifdef MAC 2496 error = mac_vnode_check_readlink(td->td_ucred, vp); 2497 if (error != 0) { 2498 vput(vp); 2499 return (error); 2500 } 2501 #endif 2502 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2503 error = EINVAL; 2504 else { 2505 aiov.iov_base = buf; 2506 aiov.iov_len = count; 2507 auio.uio_iov = &aiov; 2508 auio.uio_iovcnt = 1; 2509 auio.uio_offset = 0; 2510 auio.uio_rw = UIO_READ; 2511 auio.uio_segflg = bufseg; 2512 auio.uio_td = td; 2513 auio.uio_resid = count; 2514 error = VOP_READLINK(vp, &auio, td->td_ucred); 2515 td->td_retval[0] = count - auio.uio_resid; 2516 } 2517 vput(vp); 2518 return (error); 2519 } 2520 2521 /* 2522 * Common implementation code for chflags() and fchflags(). 2523 */ 2524 static int 2525 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2526 { 2527 struct mount *mp; 2528 struct vattr vattr; 2529 int error; 2530 2531 /* We can't support the value matching VNOVAL. */ 2532 if (flags == VNOVAL) 2533 return (EOPNOTSUPP); 2534 2535 /* 2536 * Prevent non-root users from setting flags on devices. When 2537 * a device is reused, users can retain ownership of the device 2538 * if they are allowed to set flags and programs assume that 2539 * chown can't fail when done as root. 2540 */ 2541 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2542 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2543 if (error != 0) 2544 return (error); 2545 } 2546 2547 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2548 return (error); 2549 VATTR_NULL(&vattr); 2550 vattr.va_flags = flags; 2551 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2552 #ifdef MAC 2553 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2554 if (error == 0) 2555 #endif 2556 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2557 VOP_UNLOCK(vp, 0); 2558 vn_finished_write(mp); 2559 return (error); 2560 } 2561 2562 /* 2563 * Change flags of a file given a path name. 2564 */ 2565 #ifndef _SYS_SYSPROTO_H_ 2566 struct chflags_args { 2567 const char *path; 2568 u_long flags; 2569 }; 2570 #endif 2571 int 2572 sys_chflags(struct thread *td, struct chflags_args *uap) 2573 { 2574 2575 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2576 uap->flags, 0)); 2577 } 2578 2579 #ifndef _SYS_SYSPROTO_H_ 2580 struct chflagsat_args { 2581 int fd; 2582 const char *path; 2583 u_long flags; 2584 int atflag; 2585 } 2586 #endif 2587 int 2588 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2589 { 2590 int fd = uap->fd; 2591 const char *path = uap->path; 2592 u_long flags = uap->flags; 2593 int atflag = uap->atflag; 2594 2595 if (atflag & ~AT_SYMLINK_NOFOLLOW) 2596 return (EINVAL); 2597 2598 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag)); 2599 } 2600 2601 /* 2602 * Same as chflags() but doesn't follow symlinks. 2603 */ 2604 #ifndef _SYS_SYSPROTO_H_ 2605 struct lchflags_args { 2606 const char *path; 2607 u_long flags; 2608 }; 2609 #endif 2610 int 2611 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2612 { 2613 2614 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2615 uap->flags, AT_SYMLINK_NOFOLLOW)); 2616 } 2617 2618 static int 2619 kern_chflagsat(struct thread *td, int fd, const char *path, 2620 enum uio_seg pathseg, u_long flags, int atflag) 2621 { 2622 struct nameidata nd; 2623 int error, follow; 2624 2625 AUDIT_ARG_FFLAGS(flags); 2626 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2627 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2628 &cap_fchflags_rights, td); 2629 if ((error = namei(&nd)) != 0) 2630 return (error); 2631 NDFREE(&nd, NDF_ONLY_PNBUF); 2632 error = setfflags(td, nd.ni_vp, flags); 2633 vrele(nd.ni_vp); 2634 return (error); 2635 } 2636 2637 /* 2638 * Change flags of a file given a file descriptor. 2639 */ 2640 #ifndef _SYS_SYSPROTO_H_ 2641 struct fchflags_args { 2642 int fd; 2643 u_long flags; 2644 }; 2645 #endif 2646 int 2647 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2648 { 2649 struct file *fp; 2650 int error; 2651 2652 AUDIT_ARG_FD(uap->fd); 2653 AUDIT_ARG_FFLAGS(uap->flags); 2654 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2655 &fp); 2656 if (error != 0) 2657 return (error); 2658 #ifdef AUDIT 2659 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2660 AUDIT_ARG_VNODE1(fp->f_vnode); 2661 VOP_UNLOCK(fp->f_vnode, 0); 2662 #endif 2663 error = setfflags(td, fp->f_vnode, uap->flags); 2664 fdrop(fp, td); 2665 return (error); 2666 } 2667 2668 /* 2669 * Common implementation code for chmod(), lchmod() and fchmod(). 2670 */ 2671 int 2672 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2673 { 2674 struct mount *mp; 2675 struct vattr vattr; 2676 int error; 2677 2678 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2679 return (error); 2680 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2681 VATTR_NULL(&vattr); 2682 vattr.va_mode = mode & ALLPERMS; 2683 #ifdef MAC 2684 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2685 if (error == 0) 2686 #endif 2687 error = VOP_SETATTR(vp, &vattr, cred); 2688 VOP_UNLOCK(vp, 0); 2689 vn_finished_write(mp); 2690 return (error); 2691 } 2692 2693 /* 2694 * Change mode of a file given path name. 2695 */ 2696 #ifndef _SYS_SYSPROTO_H_ 2697 struct chmod_args { 2698 char *path; 2699 int mode; 2700 }; 2701 #endif 2702 int 2703 sys_chmod(struct thread *td, struct chmod_args *uap) 2704 { 2705 2706 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2707 uap->mode, 0)); 2708 } 2709 2710 #ifndef _SYS_SYSPROTO_H_ 2711 struct fchmodat_args { 2712 int dirfd; 2713 char *path; 2714 mode_t mode; 2715 int flag; 2716 } 2717 #endif 2718 int 2719 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2720 { 2721 int flag = uap->flag; 2722 int fd = uap->fd; 2723 char *path = uap->path; 2724 mode_t mode = uap->mode; 2725 2726 if (flag & ~AT_SYMLINK_NOFOLLOW) 2727 return (EINVAL); 2728 2729 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag)); 2730 } 2731 2732 /* 2733 * Change mode of a file given path name (don't follow links.) 2734 */ 2735 #ifndef _SYS_SYSPROTO_H_ 2736 struct lchmod_args { 2737 char *path; 2738 int mode; 2739 }; 2740 #endif 2741 int 2742 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2743 { 2744 2745 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2746 uap->mode, AT_SYMLINK_NOFOLLOW)); 2747 } 2748 2749 int 2750 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2751 mode_t mode, int flag) 2752 { 2753 struct nameidata nd; 2754 int error, follow; 2755 2756 AUDIT_ARG_MODE(mode); 2757 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2758 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2759 &cap_fchmod_rights, td); 2760 if ((error = namei(&nd)) != 0) 2761 return (error); 2762 NDFREE(&nd, NDF_ONLY_PNBUF); 2763 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2764 vrele(nd.ni_vp); 2765 return (error); 2766 } 2767 2768 /* 2769 * Change mode of a file given a file descriptor. 2770 */ 2771 #ifndef _SYS_SYSPROTO_H_ 2772 struct fchmod_args { 2773 int fd; 2774 int mode; 2775 }; 2776 #endif 2777 int 2778 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2779 { 2780 struct file *fp; 2781 int error; 2782 2783 AUDIT_ARG_FD(uap->fd); 2784 AUDIT_ARG_MODE(uap->mode); 2785 2786 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2787 if (error != 0) 2788 return (error); 2789 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2790 fdrop(fp, td); 2791 return (error); 2792 } 2793 2794 /* 2795 * Common implementation for chown(), lchown(), and fchown() 2796 */ 2797 int 2798 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2799 gid_t gid) 2800 { 2801 struct mount *mp; 2802 struct vattr vattr; 2803 int error; 2804 2805 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2806 return (error); 2807 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2808 VATTR_NULL(&vattr); 2809 vattr.va_uid = uid; 2810 vattr.va_gid = gid; 2811 #ifdef MAC 2812 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2813 vattr.va_gid); 2814 if (error == 0) 2815 #endif 2816 error = VOP_SETATTR(vp, &vattr, cred); 2817 VOP_UNLOCK(vp, 0); 2818 vn_finished_write(mp); 2819 return (error); 2820 } 2821 2822 /* 2823 * Set ownership given a path name. 2824 */ 2825 #ifndef _SYS_SYSPROTO_H_ 2826 struct chown_args { 2827 char *path; 2828 int uid; 2829 int gid; 2830 }; 2831 #endif 2832 int 2833 sys_chown(struct thread *td, struct chown_args *uap) 2834 { 2835 2836 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2837 uap->gid, 0)); 2838 } 2839 2840 #ifndef _SYS_SYSPROTO_H_ 2841 struct fchownat_args { 2842 int fd; 2843 const char * path; 2844 uid_t uid; 2845 gid_t gid; 2846 int flag; 2847 }; 2848 #endif 2849 int 2850 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2851 { 2852 int flag; 2853 2854 flag = uap->flag; 2855 if (flag & ~AT_SYMLINK_NOFOLLOW) 2856 return (EINVAL); 2857 2858 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 2859 uap->gid, uap->flag)); 2860 } 2861 2862 int 2863 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2864 int uid, int gid, int flag) 2865 { 2866 struct nameidata nd; 2867 int error, follow; 2868 2869 AUDIT_ARG_OWNER(uid, gid); 2870 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2871 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2872 &cap_fchown_rights, td); 2873 2874 if ((error = namei(&nd)) != 0) 2875 return (error); 2876 NDFREE(&nd, NDF_ONLY_PNBUF); 2877 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 2878 vrele(nd.ni_vp); 2879 return (error); 2880 } 2881 2882 /* 2883 * Set ownership given a path name, do not cross symlinks. 2884 */ 2885 #ifndef _SYS_SYSPROTO_H_ 2886 struct lchown_args { 2887 char *path; 2888 int uid; 2889 int gid; 2890 }; 2891 #endif 2892 int 2893 sys_lchown(struct thread *td, struct lchown_args *uap) 2894 { 2895 2896 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2897 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 2898 } 2899 2900 /* 2901 * Set ownership given a file descriptor. 2902 */ 2903 #ifndef _SYS_SYSPROTO_H_ 2904 struct fchown_args { 2905 int fd; 2906 int uid; 2907 int gid; 2908 }; 2909 #endif 2910 int 2911 sys_fchown(struct thread *td, struct fchown_args *uap) 2912 { 2913 struct file *fp; 2914 int error; 2915 2916 AUDIT_ARG_FD(uap->fd); 2917 AUDIT_ARG_OWNER(uap->uid, uap->gid); 2918 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 2919 if (error != 0) 2920 return (error); 2921 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 2922 fdrop(fp, td); 2923 return (error); 2924 } 2925 2926 /* 2927 * Common implementation code for utimes(), lutimes(), and futimes(). 2928 */ 2929 static int 2930 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 2931 struct timespec *tsp) 2932 { 2933 struct timeval tv[2]; 2934 const struct timeval *tvp; 2935 int error; 2936 2937 if (usrtvp == NULL) { 2938 vfs_timestamp(&tsp[0]); 2939 tsp[1] = tsp[0]; 2940 } else { 2941 if (tvpseg == UIO_SYSSPACE) { 2942 tvp = usrtvp; 2943 } else { 2944 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 2945 return (error); 2946 tvp = tv; 2947 } 2948 2949 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 2950 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 2951 return (EINVAL); 2952 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 2953 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 2954 } 2955 return (0); 2956 } 2957 2958 /* 2959 * Common implementation code for futimens(), utimensat(). 2960 */ 2961 #define UTIMENS_NULL 0x1 2962 #define UTIMENS_EXIT 0x2 2963 static int 2964 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 2965 struct timespec *tsp, int *retflags) 2966 { 2967 struct timespec tsnow; 2968 int error; 2969 2970 vfs_timestamp(&tsnow); 2971 *retflags = 0; 2972 if (usrtsp == NULL) { 2973 tsp[0] = tsnow; 2974 tsp[1] = tsnow; 2975 *retflags |= UTIMENS_NULL; 2976 return (0); 2977 } 2978 if (tspseg == UIO_SYSSPACE) { 2979 tsp[0] = usrtsp[0]; 2980 tsp[1] = usrtsp[1]; 2981 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 2982 return (error); 2983 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 2984 *retflags |= UTIMENS_EXIT; 2985 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 2986 *retflags |= UTIMENS_NULL; 2987 if (tsp[0].tv_nsec == UTIME_OMIT) 2988 tsp[0].tv_sec = VNOVAL; 2989 else if (tsp[0].tv_nsec == UTIME_NOW) 2990 tsp[0] = tsnow; 2991 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 2992 return (EINVAL); 2993 if (tsp[1].tv_nsec == UTIME_OMIT) 2994 tsp[1].tv_sec = VNOVAL; 2995 else if (tsp[1].tv_nsec == UTIME_NOW) 2996 tsp[1] = tsnow; 2997 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 2998 return (EINVAL); 2999 3000 return (0); 3001 } 3002 3003 /* 3004 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3005 * and utimensat(). 3006 */ 3007 static int 3008 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3009 int numtimes, int nullflag) 3010 { 3011 struct mount *mp; 3012 struct vattr vattr; 3013 int error, setbirthtime; 3014 3015 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3016 return (error); 3017 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3018 setbirthtime = 0; 3019 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3020 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3021 setbirthtime = 1; 3022 VATTR_NULL(&vattr); 3023 vattr.va_atime = ts[0]; 3024 vattr.va_mtime = ts[1]; 3025 if (setbirthtime) 3026 vattr.va_birthtime = ts[1]; 3027 if (numtimes > 2) 3028 vattr.va_birthtime = ts[2]; 3029 if (nullflag) 3030 vattr.va_vaflags |= VA_UTIMES_NULL; 3031 #ifdef MAC 3032 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3033 vattr.va_mtime); 3034 #endif 3035 if (error == 0) 3036 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3037 VOP_UNLOCK(vp, 0); 3038 vn_finished_write(mp); 3039 return (error); 3040 } 3041 3042 /* 3043 * Set the access and modification times of a file. 3044 */ 3045 #ifndef _SYS_SYSPROTO_H_ 3046 struct utimes_args { 3047 char *path; 3048 struct timeval *tptr; 3049 }; 3050 #endif 3051 int 3052 sys_utimes(struct thread *td, struct utimes_args *uap) 3053 { 3054 3055 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3056 uap->tptr, UIO_USERSPACE)); 3057 } 3058 3059 #ifndef _SYS_SYSPROTO_H_ 3060 struct futimesat_args { 3061 int fd; 3062 const char * path; 3063 const struct timeval * times; 3064 }; 3065 #endif 3066 int 3067 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3068 { 3069 3070 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3071 uap->times, UIO_USERSPACE)); 3072 } 3073 3074 int 3075 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3076 struct timeval *tptr, enum uio_seg tptrseg) 3077 { 3078 struct nameidata nd; 3079 struct timespec ts[2]; 3080 int error; 3081 3082 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3083 return (error); 3084 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3085 &cap_futimes_rights, td); 3086 3087 if ((error = namei(&nd)) != 0) 3088 return (error); 3089 NDFREE(&nd, NDF_ONLY_PNBUF); 3090 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3091 vrele(nd.ni_vp); 3092 return (error); 3093 } 3094 3095 /* 3096 * Set the access and modification times of a file. 3097 */ 3098 #ifndef _SYS_SYSPROTO_H_ 3099 struct lutimes_args { 3100 char *path; 3101 struct timeval *tptr; 3102 }; 3103 #endif 3104 int 3105 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3106 { 3107 3108 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3109 UIO_USERSPACE)); 3110 } 3111 3112 int 3113 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, 3114 struct timeval *tptr, enum uio_seg tptrseg) 3115 { 3116 struct timespec ts[2]; 3117 struct nameidata nd; 3118 int error; 3119 3120 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3121 return (error); 3122 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3123 if ((error = namei(&nd)) != 0) 3124 return (error); 3125 NDFREE(&nd, NDF_ONLY_PNBUF); 3126 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3127 vrele(nd.ni_vp); 3128 return (error); 3129 } 3130 3131 /* 3132 * Set the access and modification times of a file. 3133 */ 3134 #ifndef _SYS_SYSPROTO_H_ 3135 struct futimes_args { 3136 int fd; 3137 struct timeval *tptr; 3138 }; 3139 #endif 3140 int 3141 sys_futimes(struct thread *td, struct futimes_args *uap) 3142 { 3143 3144 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3145 } 3146 3147 int 3148 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3149 enum uio_seg tptrseg) 3150 { 3151 struct timespec ts[2]; 3152 struct file *fp; 3153 int error; 3154 3155 AUDIT_ARG_FD(fd); 3156 error = getutimes(tptr, tptrseg, ts); 3157 if (error != 0) 3158 return (error); 3159 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3160 if (error != 0) 3161 return (error); 3162 #ifdef AUDIT 3163 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3164 AUDIT_ARG_VNODE1(fp->f_vnode); 3165 VOP_UNLOCK(fp->f_vnode, 0); 3166 #endif 3167 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3168 fdrop(fp, td); 3169 return (error); 3170 } 3171 3172 int 3173 sys_futimens(struct thread *td, struct futimens_args *uap) 3174 { 3175 3176 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3177 } 3178 3179 int 3180 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3181 enum uio_seg tptrseg) 3182 { 3183 struct timespec ts[2]; 3184 struct file *fp; 3185 int error, flags; 3186 3187 AUDIT_ARG_FD(fd); 3188 error = getutimens(tptr, tptrseg, ts, &flags); 3189 if (error != 0) 3190 return (error); 3191 if (flags & UTIMENS_EXIT) 3192 return (0); 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, flags & UTIMENS_NULL); 3202 fdrop(fp, td); 3203 return (error); 3204 } 3205 3206 int 3207 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3208 { 3209 3210 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3211 uap->times, UIO_USERSPACE, uap->flag)); 3212 } 3213 3214 int 3215 kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3216 struct timespec *tptr, enum uio_seg tptrseg, int flag) 3217 { 3218 struct nameidata nd; 3219 struct timespec ts[2]; 3220 int error, flags; 3221 3222 if (flag & ~AT_SYMLINK_NOFOLLOW) 3223 return (EINVAL); 3224 3225 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3226 return (error); 3227 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 3228 FOLLOW) | AUDITVNODE1, pathseg, path, fd, 3229 &cap_futimes_rights, td); 3230 if ((error = namei(&nd)) != 0) 3231 return (error); 3232 /* 3233 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3234 * POSIX states: 3235 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3236 * "Search permission is denied by a component of the path prefix." 3237 */ 3238 NDFREE(&nd, NDF_ONLY_PNBUF); 3239 if ((flags & UTIMENS_EXIT) == 0) 3240 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3241 vrele(nd.ni_vp); 3242 return (error); 3243 } 3244 3245 /* 3246 * Truncate a file given its path name. 3247 */ 3248 #ifndef _SYS_SYSPROTO_H_ 3249 struct truncate_args { 3250 char *path; 3251 int pad; 3252 off_t length; 3253 }; 3254 #endif 3255 int 3256 sys_truncate(struct thread *td, struct truncate_args *uap) 3257 { 3258 3259 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3260 } 3261 3262 int 3263 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) 3264 { 3265 struct mount *mp; 3266 struct vnode *vp; 3267 void *rl_cookie; 3268 struct vattr vattr; 3269 struct nameidata nd; 3270 int error; 3271 3272 if (length < 0) 3273 return(EINVAL); 3274 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3275 if ((error = namei(&nd)) != 0) 3276 return (error); 3277 vp = nd.ni_vp; 3278 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3279 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3280 vn_rangelock_unlock(vp, rl_cookie); 3281 vrele(vp); 3282 return (error); 3283 } 3284 NDFREE(&nd, NDF_ONLY_PNBUF); 3285 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3286 if (vp->v_type == VDIR) 3287 error = EISDIR; 3288 #ifdef MAC 3289 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3290 } 3291 #endif 3292 else if ((error = vn_writechk(vp)) == 0 && 3293 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3294 VATTR_NULL(&vattr); 3295 vattr.va_size = length; 3296 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3297 } 3298 VOP_UNLOCK(vp, 0); 3299 vn_finished_write(mp); 3300 vn_rangelock_unlock(vp, rl_cookie); 3301 vrele(vp); 3302 return (error); 3303 } 3304 3305 #if defined(COMPAT_43) 3306 /* 3307 * Truncate a file given its path name. 3308 */ 3309 #ifndef _SYS_SYSPROTO_H_ 3310 struct otruncate_args { 3311 char *path; 3312 long length; 3313 }; 3314 #endif 3315 int 3316 otruncate(struct thread *td, struct otruncate_args *uap) 3317 { 3318 3319 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3320 } 3321 #endif /* COMPAT_43 */ 3322 3323 #if defined(COMPAT_FREEBSD6) 3324 /* Versions with the pad argument */ 3325 int 3326 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3327 { 3328 3329 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3330 } 3331 3332 int 3333 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3334 { 3335 3336 return (kern_ftruncate(td, uap->fd, uap->length)); 3337 } 3338 #endif 3339 3340 int 3341 kern_fsync(struct thread *td, int fd, bool fullsync) 3342 { 3343 struct vnode *vp; 3344 struct mount *mp; 3345 struct file *fp; 3346 int error, lock_flags; 3347 3348 AUDIT_ARG_FD(fd); 3349 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3350 if (error != 0) 3351 return (error); 3352 vp = fp->f_vnode; 3353 #if 0 3354 if (!fullsync) 3355 /* XXXKIB: compete outstanding aio writes */; 3356 #endif 3357 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3358 if (error != 0) 3359 goto drop; 3360 if (MNT_SHARED_WRITES(mp) || 3361 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3362 lock_flags = LK_SHARED; 3363 } else { 3364 lock_flags = LK_EXCLUSIVE; 3365 } 3366 vn_lock(vp, lock_flags | LK_RETRY); 3367 AUDIT_ARG_VNODE1(vp); 3368 if (vp->v_object != NULL) { 3369 VM_OBJECT_WLOCK(vp->v_object); 3370 vm_object_page_clean(vp->v_object, 0, 0, 0); 3371 VM_OBJECT_WUNLOCK(vp->v_object); 3372 } 3373 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3374 VOP_UNLOCK(vp, 0); 3375 vn_finished_write(mp); 3376 drop: 3377 fdrop(fp, td); 3378 return (error); 3379 } 3380 3381 /* 3382 * Sync an open file. 3383 */ 3384 #ifndef _SYS_SYSPROTO_H_ 3385 struct fsync_args { 3386 int fd; 3387 }; 3388 #endif 3389 int 3390 sys_fsync(struct thread *td, struct fsync_args *uap) 3391 { 3392 3393 return (kern_fsync(td, uap->fd, true)); 3394 } 3395 3396 int 3397 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3398 { 3399 3400 return (kern_fsync(td, uap->fd, false)); 3401 } 3402 3403 /* 3404 * Rename files. Source and destination must either both be directories, or 3405 * both not be directories. If target is a directory, it must be empty. 3406 */ 3407 #ifndef _SYS_SYSPROTO_H_ 3408 struct rename_args { 3409 char *from; 3410 char *to; 3411 }; 3412 #endif 3413 int 3414 sys_rename(struct thread *td, struct rename_args *uap) 3415 { 3416 3417 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3418 uap->to, UIO_USERSPACE)); 3419 } 3420 3421 #ifndef _SYS_SYSPROTO_H_ 3422 struct renameat_args { 3423 int oldfd; 3424 char *old; 3425 int newfd; 3426 char *new; 3427 }; 3428 #endif 3429 int 3430 sys_renameat(struct thread *td, struct renameat_args *uap) 3431 { 3432 3433 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3434 UIO_USERSPACE)); 3435 } 3436 3437 int 3438 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new, 3439 enum uio_seg pathseg) 3440 { 3441 struct mount *mp = NULL; 3442 struct vnode *tvp, *fvp, *tdvp; 3443 struct nameidata fromnd, tond; 3444 int error; 3445 3446 again: 3447 bwillwrite(); 3448 #ifdef MAC 3449 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3450 AUDITVNODE1, pathseg, old, oldfd, 3451 &cap_renameat_source_rights, td); 3452 #else 3453 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3454 pathseg, old, oldfd, 3455 &cap_renameat_source_rights, td); 3456 #endif 3457 3458 if ((error = namei(&fromnd)) != 0) 3459 return (error); 3460 #ifdef MAC 3461 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3462 fromnd.ni_vp, &fromnd.ni_cnd); 3463 VOP_UNLOCK(fromnd.ni_dvp, 0); 3464 if (fromnd.ni_dvp != fromnd.ni_vp) 3465 VOP_UNLOCK(fromnd.ni_vp, 0); 3466 #endif 3467 fvp = fromnd.ni_vp; 3468 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3469 SAVESTART | AUDITVNODE2, pathseg, new, newfd, 3470 &cap_renameat_target_rights, td); 3471 if (fromnd.ni_vp->v_type == VDIR) 3472 tond.ni_cnd.cn_flags |= WILLBEDIR; 3473 if ((error = namei(&tond)) != 0) { 3474 /* Translate error code for rename("dir1", "dir2/."). */ 3475 if (error == EISDIR && fvp->v_type == VDIR) 3476 error = EINVAL; 3477 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3478 vrele(fromnd.ni_dvp); 3479 vrele(fvp); 3480 goto out1; 3481 } 3482 tdvp = tond.ni_dvp; 3483 tvp = tond.ni_vp; 3484 error = vn_start_write(fvp, &mp, V_NOWAIT); 3485 if (error != 0) { 3486 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3487 NDFREE(&tond, NDF_ONLY_PNBUF); 3488 if (tvp != NULL) 3489 vput(tvp); 3490 if (tdvp == tvp) 3491 vrele(tdvp); 3492 else 3493 vput(tdvp); 3494 vrele(fromnd.ni_dvp); 3495 vrele(fvp); 3496 vrele(tond.ni_startdir); 3497 if (fromnd.ni_startdir != NULL) 3498 vrele(fromnd.ni_startdir); 3499 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3500 if (error != 0) 3501 return (error); 3502 goto again; 3503 } 3504 if (tvp != NULL) { 3505 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3506 error = ENOTDIR; 3507 goto out; 3508 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3509 error = EISDIR; 3510 goto out; 3511 } 3512 #ifdef CAPABILITIES 3513 if (newfd != AT_FDCWD) { 3514 /* 3515 * If the target already exists we require CAP_UNLINKAT 3516 * from 'newfd'. 3517 */ 3518 error = cap_check(&tond.ni_filecaps.fc_rights, 3519 &cap_unlinkat_rights); 3520 if (error != 0) 3521 goto out; 3522 } 3523 #endif 3524 } 3525 if (fvp == tdvp) { 3526 error = EINVAL; 3527 goto out; 3528 } 3529 /* 3530 * If the source is the same as the destination (that is, if they 3531 * are links to the same vnode), then there is nothing to do. 3532 */ 3533 if (fvp == tvp) 3534 error = -1; 3535 #ifdef MAC 3536 else 3537 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3538 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3539 #endif 3540 out: 3541 if (error == 0) { 3542 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3543 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3544 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3545 NDFREE(&tond, NDF_ONLY_PNBUF); 3546 } else { 3547 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3548 NDFREE(&tond, NDF_ONLY_PNBUF); 3549 if (tvp != NULL) 3550 vput(tvp); 3551 if (tdvp == tvp) 3552 vrele(tdvp); 3553 else 3554 vput(tdvp); 3555 vrele(fromnd.ni_dvp); 3556 vrele(fvp); 3557 } 3558 vrele(tond.ni_startdir); 3559 vn_finished_write(mp); 3560 out1: 3561 if (fromnd.ni_startdir) 3562 vrele(fromnd.ni_startdir); 3563 if (error == -1) 3564 return (0); 3565 return (error); 3566 } 3567 3568 /* 3569 * Make a directory file. 3570 */ 3571 #ifndef _SYS_SYSPROTO_H_ 3572 struct mkdir_args { 3573 char *path; 3574 int mode; 3575 }; 3576 #endif 3577 int 3578 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3579 { 3580 3581 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3582 uap->mode)); 3583 } 3584 3585 #ifndef _SYS_SYSPROTO_H_ 3586 struct mkdirat_args { 3587 int fd; 3588 char *path; 3589 mode_t mode; 3590 }; 3591 #endif 3592 int 3593 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3594 { 3595 3596 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3597 } 3598 3599 int 3600 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg, 3601 int mode) 3602 { 3603 struct mount *mp; 3604 struct vnode *vp; 3605 struct vattr vattr; 3606 struct nameidata nd; 3607 int error; 3608 3609 AUDIT_ARG_MODE(mode); 3610 restart: 3611 bwillwrite(); 3612 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3613 NOCACHE, segflg, path, fd, &cap_mkdirat_rights, 3614 td); 3615 nd.ni_cnd.cn_flags |= WILLBEDIR; 3616 if ((error = namei(&nd)) != 0) 3617 return (error); 3618 vp = nd.ni_vp; 3619 if (vp != NULL) { 3620 NDFREE(&nd, NDF_ONLY_PNBUF); 3621 /* 3622 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3623 * the strange behaviour of leaving the vnode unlocked 3624 * if the target is the same vnode as the parent. 3625 */ 3626 if (vp == nd.ni_dvp) 3627 vrele(nd.ni_dvp); 3628 else 3629 vput(nd.ni_dvp); 3630 vrele(vp); 3631 return (EEXIST); 3632 } 3633 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3634 NDFREE(&nd, NDF_ONLY_PNBUF); 3635 vput(nd.ni_dvp); 3636 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3637 return (error); 3638 goto restart; 3639 } 3640 VATTR_NULL(&vattr); 3641 vattr.va_type = VDIR; 3642 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3643 #ifdef MAC 3644 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3645 &vattr); 3646 if (error != 0) 3647 goto out; 3648 #endif 3649 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3650 #ifdef MAC 3651 out: 3652 #endif 3653 NDFREE(&nd, NDF_ONLY_PNBUF); 3654 vput(nd.ni_dvp); 3655 if (error == 0) 3656 vput(nd.ni_vp); 3657 vn_finished_write(mp); 3658 return (error); 3659 } 3660 3661 /* 3662 * Remove a directory file. 3663 */ 3664 #ifndef _SYS_SYSPROTO_H_ 3665 struct rmdir_args { 3666 char *path; 3667 }; 3668 #endif 3669 int 3670 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3671 { 3672 3673 return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE)); 3674 } 3675 3676 int 3677 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg) 3678 { 3679 struct mount *mp; 3680 struct vnode *vp; 3681 struct nameidata nd; 3682 int error; 3683 3684 restart: 3685 bwillwrite(); 3686 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, 3687 pathseg, path, fd, &cap_unlinkat_rights, td); 3688 if ((error = namei(&nd)) != 0) 3689 return (error); 3690 vp = nd.ni_vp; 3691 if (vp->v_type != VDIR) { 3692 error = ENOTDIR; 3693 goto out; 3694 } 3695 /* 3696 * No rmdir "." please. 3697 */ 3698 if (nd.ni_dvp == vp) { 3699 error = EINVAL; 3700 goto out; 3701 } 3702 /* 3703 * The root of a mounted filesystem cannot be deleted. 3704 */ 3705 if (vp->v_vflag & VV_ROOT) { 3706 error = EBUSY; 3707 goto out; 3708 } 3709 #ifdef MAC 3710 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3711 &nd.ni_cnd); 3712 if (error != 0) 3713 goto out; 3714 #endif 3715 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3716 NDFREE(&nd, NDF_ONLY_PNBUF); 3717 vput(vp); 3718 if (nd.ni_dvp == vp) 3719 vrele(nd.ni_dvp); 3720 else 3721 vput(nd.ni_dvp); 3722 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3723 return (error); 3724 goto restart; 3725 } 3726 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3727 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3728 vn_finished_write(mp); 3729 out: 3730 NDFREE(&nd, NDF_ONLY_PNBUF); 3731 vput(vp); 3732 if (nd.ni_dvp == vp) 3733 vrele(nd.ni_dvp); 3734 else 3735 vput(nd.ni_dvp); 3736 return (error); 3737 } 3738 3739 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3740 int 3741 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3742 long *basep, void (*func)(struct freebsd11_dirent *)) 3743 { 3744 struct freebsd11_dirent dstdp; 3745 struct dirent *dp, *edp; 3746 char *dirbuf; 3747 off_t base; 3748 ssize_t resid, ucount; 3749 int error; 3750 3751 /* XXX arbitrary sanity limit on `count'. */ 3752 count = min(count, 64 * 1024); 3753 3754 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3755 3756 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3757 UIO_SYSSPACE); 3758 if (error != 0) 3759 goto done; 3760 if (basep != NULL) 3761 *basep = base; 3762 3763 ucount = 0; 3764 for (dp = (struct dirent *)dirbuf, 3765 edp = (struct dirent *)&dirbuf[count - resid]; 3766 ucount < count && dp < edp; ) { 3767 if (dp->d_reclen == 0) 3768 break; 3769 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3770 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3771 continue; 3772 dstdp.d_type = dp->d_type; 3773 dstdp.d_namlen = dp->d_namlen; 3774 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3775 if (dstdp.d_fileno != dp->d_fileno) { 3776 switch (ino64_trunc_error) { 3777 default: 3778 case 0: 3779 break; 3780 case 1: 3781 error = EOVERFLOW; 3782 goto done; 3783 case 2: 3784 dstdp.d_fileno = UINT32_MAX; 3785 break; 3786 } 3787 } 3788 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3789 ((dp->d_namlen + 1 + 3) &~ 3); 3790 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3791 bzero(dstdp.d_name + dstdp.d_namlen, 3792 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3793 dstdp.d_namlen); 3794 MPASS(dstdp.d_reclen <= dp->d_reclen); 3795 MPASS(ucount + dstdp.d_reclen <= count); 3796 if (func != NULL) 3797 func(&dstdp); 3798 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3799 if (error != 0) 3800 break; 3801 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3802 ucount += dstdp.d_reclen; 3803 } 3804 3805 done: 3806 free(dirbuf, M_TEMP); 3807 if (error == 0) 3808 td->td_retval[0] = ucount; 3809 return (error); 3810 } 3811 #endif /* COMPAT */ 3812 3813 #ifdef COMPAT_43 3814 static void 3815 ogetdirentries_cvt(struct freebsd11_dirent *dp) 3816 { 3817 #if (BYTE_ORDER == LITTLE_ENDIAN) 3818 /* 3819 * The expected low byte of dp->d_namlen is our dp->d_type. 3820 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 3821 */ 3822 dp->d_type = dp->d_namlen; 3823 dp->d_namlen = 0; 3824 #else 3825 /* 3826 * The dp->d_type is the high byte of the expected dp->d_namlen, 3827 * so must be zero'ed. 3828 */ 3829 dp->d_type = 0; 3830 #endif 3831 } 3832 3833 /* 3834 * Read a block of directory entries in a filesystem independent format. 3835 */ 3836 #ifndef _SYS_SYSPROTO_H_ 3837 struct ogetdirentries_args { 3838 int fd; 3839 char *buf; 3840 u_int count; 3841 long *basep; 3842 }; 3843 #endif 3844 int 3845 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3846 { 3847 long loff; 3848 int error; 3849 3850 error = kern_ogetdirentries(td, uap, &loff); 3851 if (error == 0) 3852 error = copyout(&loff, uap->basep, sizeof(long)); 3853 return (error); 3854 } 3855 3856 int 3857 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3858 long *ploff) 3859 { 3860 long base; 3861 int error; 3862 3863 /* XXX arbitrary sanity limit on `count'. */ 3864 if (uap->count > 64 * 1024) 3865 return (EINVAL); 3866 3867 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3868 &base, ogetdirentries_cvt); 3869 3870 if (error == 0 && uap->basep != NULL) 3871 error = copyout(&base, uap->basep, sizeof(long)); 3872 3873 return (error); 3874 } 3875 #endif /* COMPAT_43 */ 3876 3877 #if defined(COMPAT_FREEBSD11) 3878 #ifndef _SYS_SYSPROTO_H_ 3879 struct freebsd11_getdirentries_args { 3880 int fd; 3881 char *buf; 3882 u_int count; 3883 long *basep; 3884 }; 3885 #endif 3886 int 3887 freebsd11_getdirentries(struct thread *td, 3888 struct freebsd11_getdirentries_args *uap) 3889 { 3890 long base; 3891 int error; 3892 3893 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3894 &base, NULL); 3895 3896 if (error == 0 && uap->basep != NULL) 3897 error = copyout(&base, uap->basep, sizeof(long)); 3898 return (error); 3899 } 3900 3901 int 3902 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 3903 { 3904 struct freebsd11_getdirentries_args ap; 3905 3906 ap.fd = uap->fd; 3907 ap.buf = uap->buf; 3908 ap.count = uap->count; 3909 ap.basep = NULL; 3910 return (freebsd11_getdirentries(td, &ap)); 3911 } 3912 #endif /* COMPAT_FREEBSD11 */ 3913 3914 /* 3915 * Read a block of directory entries in a filesystem independent format. 3916 */ 3917 int 3918 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 3919 { 3920 off_t base; 3921 int error; 3922 3923 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 3924 NULL, UIO_USERSPACE); 3925 if (error != 0) 3926 return (error); 3927 if (uap->basep != NULL) 3928 error = copyout(&base, uap->basep, sizeof(off_t)); 3929 return (error); 3930 } 3931 3932 int 3933 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 3934 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 3935 { 3936 struct vnode *vp; 3937 struct file *fp; 3938 struct uio auio; 3939 struct iovec aiov; 3940 off_t loff; 3941 int error, eofflag; 3942 off_t foffset; 3943 3944 AUDIT_ARG_FD(fd); 3945 if (count > IOSIZE_MAX) 3946 return (EINVAL); 3947 auio.uio_resid = count; 3948 error = getvnode(td, fd, &cap_read_rights, &fp); 3949 if (error != 0) 3950 return (error); 3951 if ((fp->f_flag & FREAD) == 0) { 3952 fdrop(fp, td); 3953 return (EBADF); 3954 } 3955 vp = fp->f_vnode; 3956 foffset = foffset_lock(fp, 0); 3957 unionread: 3958 if (vp->v_type != VDIR) { 3959 error = EINVAL; 3960 goto fail; 3961 } 3962 aiov.iov_base = buf; 3963 aiov.iov_len = count; 3964 auio.uio_iov = &aiov; 3965 auio.uio_iovcnt = 1; 3966 auio.uio_rw = UIO_READ; 3967 auio.uio_segflg = bufseg; 3968 auio.uio_td = td; 3969 vn_lock(vp, LK_SHARED | LK_RETRY); 3970 AUDIT_ARG_VNODE1(vp); 3971 loff = auio.uio_offset = foffset; 3972 #ifdef MAC 3973 error = mac_vnode_check_readdir(td->td_ucred, vp); 3974 if (error == 0) 3975 #endif 3976 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 3977 NULL); 3978 foffset = auio.uio_offset; 3979 if (error != 0) { 3980 VOP_UNLOCK(vp, 0); 3981 goto fail; 3982 } 3983 if (count == auio.uio_resid && 3984 (vp->v_vflag & VV_ROOT) && 3985 (vp->v_mount->mnt_flag & MNT_UNION)) { 3986 struct vnode *tvp = vp; 3987 3988 vp = vp->v_mount->mnt_vnodecovered; 3989 VREF(vp); 3990 fp->f_vnode = vp; 3991 fp->f_data = vp; 3992 foffset = 0; 3993 vput(tvp); 3994 goto unionread; 3995 } 3996 VOP_UNLOCK(vp, 0); 3997 *basep = loff; 3998 if (residp != NULL) 3999 *residp = auio.uio_resid; 4000 td->td_retval[0] = count - auio.uio_resid; 4001 fail: 4002 foffset_unlock(fp, foffset, 0); 4003 fdrop(fp, td); 4004 return (error); 4005 } 4006 4007 /* 4008 * Set the mode mask for creation of filesystem nodes. 4009 */ 4010 #ifndef _SYS_SYSPROTO_H_ 4011 struct umask_args { 4012 int newmask; 4013 }; 4014 #endif 4015 int 4016 sys_umask(struct thread *td, struct umask_args *uap) 4017 { 4018 struct filedesc *fdp; 4019 4020 fdp = td->td_proc->p_fd; 4021 FILEDESC_XLOCK(fdp); 4022 td->td_retval[0] = fdp->fd_cmask; 4023 fdp->fd_cmask = uap->newmask & ALLPERMS; 4024 FILEDESC_XUNLOCK(fdp); 4025 return (0); 4026 } 4027 4028 /* 4029 * Void all references to file by ripping underlying filesystem away from 4030 * vnode. 4031 */ 4032 #ifndef _SYS_SYSPROTO_H_ 4033 struct revoke_args { 4034 char *path; 4035 }; 4036 #endif 4037 int 4038 sys_revoke(struct thread *td, struct revoke_args *uap) 4039 { 4040 struct vnode *vp; 4041 struct vattr vattr; 4042 struct nameidata nd; 4043 int error; 4044 4045 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4046 uap->path, td); 4047 if ((error = namei(&nd)) != 0) 4048 return (error); 4049 vp = nd.ni_vp; 4050 NDFREE(&nd, NDF_ONLY_PNBUF); 4051 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4052 error = EINVAL; 4053 goto out; 4054 } 4055 #ifdef MAC 4056 error = mac_vnode_check_revoke(td->td_ucred, vp); 4057 if (error != 0) 4058 goto out; 4059 #endif 4060 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4061 if (error != 0) 4062 goto out; 4063 if (td->td_ucred->cr_uid != vattr.va_uid) { 4064 error = priv_check(td, PRIV_VFS_ADMIN); 4065 if (error != 0) 4066 goto out; 4067 } 4068 if (vcount(vp) > 1) 4069 VOP_REVOKE(vp, REVOKEALL); 4070 out: 4071 vput(vp); 4072 return (error); 4073 } 4074 4075 /* 4076 * Convert a user file descriptor to a kernel file entry and check that, if it 4077 * is a capability, the correct rights are present. A reference on the file 4078 * entry is held upon returning. 4079 */ 4080 int 4081 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4082 { 4083 struct file *fp; 4084 int error; 4085 4086 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); 4087 if (error != 0) 4088 return (error); 4089 4090 /* 4091 * The file could be not of the vnode type, or it may be not 4092 * yet fully initialized, in which case the f_vnode pointer 4093 * may be set, but f_ops is still badfileops. E.g., 4094 * devfs_open() transiently create such situation to 4095 * facilitate csw d_fdopen(). 4096 * 4097 * Dupfdopen() handling in kern_openat() installs the 4098 * half-baked file into the process descriptor table, allowing 4099 * other thread to dereference it. Guard against the race by 4100 * checking f_ops. 4101 */ 4102 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4103 fdrop(fp, td); 4104 return (EINVAL); 4105 } 4106 *fpp = fp; 4107 return (0); 4108 } 4109 4110 4111 /* 4112 * Get an (NFS) file handle. 4113 */ 4114 #ifndef _SYS_SYSPROTO_H_ 4115 struct lgetfh_args { 4116 char *fname; 4117 fhandle_t *fhp; 4118 }; 4119 #endif 4120 int 4121 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4122 { 4123 struct nameidata nd; 4124 fhandle_t fh; 4125 struct vnode *vp; 4126 int error; 4127 4128 error = priv_check(td, PRIV_VFS_GETFH); 4129 if (error != 0) 4130 return (error); 4131 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4132 uap->fname, td); 4133 error = namei(&nd); 4134 if (error != 0) 4135 return (error); 4136 NDFREE(&nd, NDF_ONLY_PNBUF); 4137 vp = nd.ni_vp; 4138 bzero(&fh, sizeof(fh)); 4139 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4140 error = VOP_VPTOFH(vp, &fh.fh_fid); 4141 vput(vp); 4142 if (error == 0) 4143 error = copyout(&fh, uap->fhp, sizeof (fh)); 4144 return (error); 4145 } 4146 4147 #ifndef _SYS_SYSPROTO_H_ 4148 struct getfh_args { 4149 char *fname; 4150 fhandle_t *fhp; 4151 }; 4152 #endif 4153 int 4154 sys_getfh(struct thread *td, struct getfh_args *uap) 4155 { 4156 struct nameidata nd; 4157 fhandle_t fh; 4158 struct vnode *vp; 4159 int error; 4160 4161 error = priv_check(td, PRIV_VFS_GETFH); 4162 if (error != 0) 4163 return (error); 4164 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4165 uap->fname, td); 4166 error = namei(&nd); 4167 if (error != 0) 4168 return (error); 4169 NDFREE(&nd, NDF_ONLY_PNBUF); 4170 vp = nd.ni_vp; 4171 bzero(&fh, sizeof(fh)); 4172 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4173 error = VOP_VPTOFH(vp, &fh.fh_fid); 4174 vput(vp); 4175 if (error == 0) 4176 error = copyout(&fh, uap->fhp, sizeof (fh)); 4177 return (error); 4178 } 4179 4180 /* 4181 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4182 * open descriptor. 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 fhopen_args { 4189 const struct fhandle *u_fhp; 4190 int flags; 4191 }; 4192 #endif 4193 int 4194 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4195 { 4196 struct mount *mp; 4197 struct vnode *vp; 4198 struct fhandle fhp; 4199 struct file *fp; 4200 int fmode, error; 4201 int indx; 4202 4203 error = priv_check(td, PRIV_VFS_FHOPEN); 4204 if (error != 0) 4205 return (error); 4206 indx = -1; 4207 fmode = FFLAGS(uap->flags); 4208 /* why not allow a non-read/write open for our lockd? */ 4209 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4210 return (EINVAL); 4211 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4212 if (error != 0) 4213 return(error); 4214 /* find the mount point */ 4215 mp = vfs_busyfs(&fhp.fh_fsid); 4216 if (mp == NULL) 4217 return (ESTALE); 4218 /* now give me my vnode, it gets returned to me locked */ 4219 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4220 vfs_unbusy(mp); 4221 if (error != 0) 4222 return (error); 4223 4224 error = falloc_noinstall(td, &fp); 4225 if (error != 0) { 4226 vput(vp); 4227 return (error); 4228 } 4229 /* 4230 * An extra reference on `fp' has been held for us by 4231 * falloc_noinstall(). 4232 */ 4233 4234 #ifdef INVARIANTS 4235 td->td_dupfd = -1; 4236 #endif 4237 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4238 if (error != 0) { 4239 KASSERT(fp->f_ops == &badfileops, 4240 ("VOP_OPEN in fhopen() set f_ops")); 4241 KASSERT(td->td_dupfd < 0, 4242 ("fhopen() encountered fdopen()")); 4243 4244 vput(vp); 4245 goto bad; 4246 } 4247 #ifdef INVARIANTS 4248 td->td_dupfd = 0; 4249 #endif 4250 fp->f_vnode = vp; 4251 fp->f_seqcount = 1; 4252 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp, 4253 &vnops); 4254 VOP_UNLOCK(vp, 0); 4255 if ((fmode & O_TRUNC) != 0) { 4256 error = fo_truncate(fp, 0, td->td_ucred, td); 4257 if (error != 0) 4258 goto bad; 4259 } 4260 4261 error = finstall(td, fp, &indx, fmode, NULL); 4262 bad: 4263 fdrop(fp, td); 4264 td->td_retval[0] = indx; 4265 return (error); 4266 } 4267 4268 /* 4269 * Stat an (NFS) file handle. 4270 */ 4271 #ifndef _SYS_SYSPROTO_H_ 4272 struct fhstat_args { 4273 struct fhandle *u_fhp; 4274 struct stat *sb; 4275 }; 4276 #endif 4277 int 4278 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4279 { 4280 struct stat sb; 4281 struct fhandle fh; 4282 int error; 4283 4284 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4285 if (error != 0) 4286 return (error); 4287 error = kern_fhstat(td, fh, &sb); 4288 if (error == 0) 4289 error = copyout(&sb, uap->sb, sizeof(sb)); 4290 return (error); 4291 } 4292 4293 int 4294 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4295 { 4296 struct mount *mp; 4297 struct vnode *vp; 4298 int error; 4299 4300 error = priv_check(td, PRIV_VFS_FHSTAT); 4301 if (error != 0) 4302 return (error); 4303 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4304 return (ESTALE); 4305 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4306 vfs_unbusy(mp); 4307 if (error != 0) 4308 return (error); 4309 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td); 4310 vput(vp); 4311 return (error); 4312 } 4313 4314 /* 4315 * Implement fstatfs() for (NFS) file handles. 4316 */ 4317 #ifndef _SYS_SYSPROTO_H_ 4318 struct fhstatfs_args { 4319 struct fhandle *u_fhp; 4320 struct statfs *buf; 4321 }; 4322 #endif 4323 int 4324 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4325 { 4326 struct statfs *sfp; 4327 fhandle_t fh; 4328 int error; 4329 4330 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4331 if (error != 0) 4332 return (error); 4333 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4334 error = kern_fhstatfs(td, fh, sfp); 4335 if (error == 0) 4336 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4337 free(sfp, M_STATFS); 4338 return (error); 4339 } 4340 4341 int 4342 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4343 { 4344 struct statfs *sp; 4345 struct mount *mp; 4346 struct vnode *vp; 4347 int error; 4348 4349 error = priv_check(td, PRIV_VFS_FHSTATFS); 4350 if (error != 0) 4351 return (error); 4352 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4353 return (ESTALE); 4354 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4355 if (error != 0) { 4356 vfs_unbusy(mp); 4357 return (error); 4358 } 4359 vput(vp); 4360 error = prison_canseemount(td->td_ucred, mp); 4361 if (error != 0) 4362 goto out; 4363 #ifdef MAC 4364 error = mac_mount_check_stat(td->td_ucred, mp); 4365 if (error != 0) 4366 goto out; 4367 #endif 4368 /* 4369 * Set these in case the underlying filesystem fails to do so. 4370 */ 4371 sp = &mp->mnt_stat; 4372 sp->f_version = STATFS_VERSION; 4373 sp->f_namemax = NAME_MAX; 4374 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 4375 error = VFS_STATFS(mp, sp); 4376 if (error == 0) 4377 *buf = *sp; 4378 out: 4379 vfs_unbusy(mp); 4380 return (error); 4381 } 4382 4383 int 4384 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len) 4385 { 4386 struct file *fp; 4387 struct mount *mp; 4388 struct vnode *vp; 4389 off_t olen, ooffset; 4390 int error; 4391 #ifdef AUDIT 4392 int audited_vnode1 = 0; 4393 #endif 4394 4395 AUDIT_ARG_FD(fd); 4396 if (offset < 0 || len <= 0) 4397 return (EINVAL); 4398 /* Check for wrap. */ 4399 if (offset > OFF_MAX - len) 4400 return (EFBIG); 4401 AUDIT_ARG_FD(fd); 4402 error = fget(td, fd, &cap_pwrite_rights, &fp); 4403 if (error != 0) 4404 return (error); 4405 AUDIT_ARG_FILE(td->td_proc, fp); 4406 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4407 error = ESPIPE; 4408 goto out; 4409 } 4410 if ((fp->f_flag & FWRITE) == 0) { 4411 error = EBADF; 4412 goto out; 4413 } 4414 if (fp->f_type != DTYPE_VNODE) { 4415 error = ENODEV; 4416 goto out; 4417 } 4418 vp = fp->f_vnode; 4419 if (vp->v_type != VREG) { 4420 error = ENODEV; 4421 goto out; 4422 } 4423 4424 /* Allocating blocks may take a long time, so iterate. */ 4425 for (;;) { 4426 olen = len; 4427 ooffset = offset; 4428 4429 bwillwrite(); 4430 mp = NULL; 4431 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 4432 if (error != 0) 4433 break; 4434 error = vn_lock(vp, LK_EXCLUSIVE); 4435 if (error != 0) { 4436 vn_finished_write(mp); 4437 break; 4438 } 4439 #ifdef AUDIT 4440 if (!audited_vnode1) { 4441 AUDIT_ARG_VNODE1(vp); 4442 audited_vnode1 = 1; 4443 } 4444 #endif 4445 #ifdef MAC 4446 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp); 4447 if (error == 0) 4448 #endif 4449 error = VOP_ALLOCATE(vp, &offset, &len); 4450 VOP_UNLOCK(vp, 0); 4451 vn_finished_write(mp); 4452 4453 if (olen + ooffset != offset + len) { 4454 panic("offset + len changed from %jx/%jx to %jx/%jx", 4455 ooffset, olen, offset, len); 4456 } 4457 if (error != 0 || len == 0) 4458 break; 4459 KASSERT(olen > len, ("Iteration did not make progress?")); 4460 maybe_yield(); 4461 } 4462 out: 4463 fdrop(fp, td); 4464 return (error); 4465 } 4466 4467 int 4468 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap) 4469 { 4470 int error; 4471 4472 error = kern_posix_fallocate(td, uap->fd, uap->offset, uap->len); 4473 return (kern_posix_error(td, error)); 4474 } 4475 4476 /* 4477 * Unlike madvise(2), we do not make a best effort to remember every 4478 * possible caching hint. Instead, we remember the last setting with 4479 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4480 * region of any current setting. 4481 */ 4482 int 4483 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4484 int advice) 4485 { 4486 struct fadvise_info *fa, *new; 4487 struct file *fp; 4488 struct vnode *vp; 4489 off_t end; 4490 int error; 4491 4492 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4493 return (EINVAL); 4494 AUDIT_ARG_VALUE(advice); 4495 switch (advice) { 4496 case POSIX_FADV_SEQUENTIAL: 4497 case POSIX_FADV_RANDOM: 4498 case POSIX_FADV_NOREUSE: 4499 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4500 break; 4501 case POSIX_FADV_NORMAL: 4502 case POSIX_FADV_WILLNEED: 4503 case POSIX_FADV_DONTNEED: 4504 new = NULL; 4505 break; 4506 default: 4507 return (EINVAL); 4508 } 4509 /* XXX: CAP_POSIX_FADVISE? */ 4510 AUDIT_ARG_FD(fd); 4511 error = fget(td, fd, &cap_no_rights, &fp); 4512 if (error != 0) 4513 goto out; 4514 AUDIT_ARG_FILE(td->td_proc, fp); 4515 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4516 error = ESPIPE; 4517 goto out; 4518 } 4519 if (fp->f_type != DTYPE_VNODE) { 4520 error = ENODEV; 4521 goto out; 4522 } 4523 vp = fp->f_vnode; 4524 if (vp->v_type != VREG) { 4525 error = ENODEV; 4526 goto out; 4527 } 4528 if (len == 0) 4529 end = OFF_MAX; 4530 else 4531 end = offset + len - 1; 4532 switch (advice) { 4533 case POSIX_FADV_SEQUENTIAL: 4534 case POSIX_FADV_RANDOM: 4535 case POSIX_FADV_NOREUSE: 4536 /* 4537 * Try to merge any existing non-standard region with 4538 * this new region if possible, otherwise create a new 4539 * non-standard region for this request. 4540 */ 4541 mtx_pool_lock(mtxpool_sleep, fp); 4542 fa = fp->f_advice; 4543 if (fa != NULL && fa->fa_advice == advice && 4544 ((fa->fa_start <= end && fa->fa_end >= offset) || 4545 (end != OFF_MAX && fa->fa_start == end + 1) || 4546 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4547 if (offset < fa->fa_start) 4548 fa->fa_start = offset; 4549 if (end > fa->fa_end) 4550 fa->fa_end = end; 4551 } else { 4552 new->fa_advice = advice; 4553 new->fa_start = offset; 4554 new->fa_end = end; 4555 fp->f_advice = new; 4556 new = fa; 4557 } 4558 mtx_pool_unlock(mtxpool_sleep, fp); 4559 break; 4560 case POSIX_FADV_NORMAL: 4561 /* 4562 * If a the "normal" region overlaps with an existing 4563 * non-standard region, trim or remove the 4564 * non-standard region. 4565 */ 4566 mtx_pool_lock(mtxpool_sleep, fp); 4567 fa = fp->f_advice; 4568 if (fa != NULL) { 4569 if (offset <= fa->fa_start && end >= fa->fa_end) { 4570 new = fa; 4571 fp->f_advice = NULL; 4572 } else if (offset <= fa->fa_start && 4573 end >= fa->fa_start) 4574 fa->fa_start = end + 1; 4575 else if (offset <= fa->fa_end && end >= fa->fa_end) 4576 fa->fa_end = offset - 1; 4577 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4578 /* 4579 * If the "normal" region is a middle 4580 * portion of the existing 4581 * non-standard region, just remove 4582 * the whole thing rather than picking 4583 * one side or the other to 4584 * preserve. 4585 */ 4586 new = fa; 4587 fp->f_advice = NULL; 4588 } 4589 } 4590 mtx_pool_unlock(mtxpool_sleep, fp); 4591 break; 4592 case POSIX_FADV_WILLNEED: 4593 case POSIX_FADV_DONTNEED: 4594 error = VOP_ADVISE(vp, offset, end, advice); 4595 break; 4596 } 4597 out: 4598 if (fp != NULL) 4599 fdrop(fp, td); 4600 free(new, M_FADVISE); 4601 return (error); 4602 } 4603 4604 int 4605 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4606 { 4607 int error; 4608 4609 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4610 uap->advice); 4611 return (kern_posix_error(td, error)); 4612 } 4613