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 */ 2069 void 2070 cvtstat(struct stat *st, struct ostat *ost) 2071 { 2072 2073 bzero(ost, sizeof(*ost)); 2074 ost->st_dev = st->st_dev; 2075 ost->st_ino = st->st_ino; 2076 ost->st_mode = st->st_mode; 2077 ost->st_nlink = st->st_nlink; 2078 ost->st_uid = st->st_uid; 2079 ost->st_gid = st->st_gid; 2080 ost->st_rdev = st->st_rdev; 2081 if (st->st_size < (quad_t)1 << 32) 2082 ost->st_size = st->st_size; 2083 else 2084 ost->st_size = -2; 2085 ost->st_atim = st->st_atim; 2086 ost->st_mtim = st->st_mtim; 2087 ost->st_ctim = st->st_ctim; 2088 ost->st_blksize = st->st_blksize; 2089 ost->st_blocks = st->st_blocks; 2090 ost->st_flags = st->st_flags; 2091 ost->st_gen = st->st_gen; 2092 } 2093 #endif /* COMPAT_43 */ 2094 2095 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2096 int ino64_trunc_error; 2097 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2098 &ino64_trunc_error, 0, 2099 "Error on truncation of inode number, device id or link count"); 2100 int 2101 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2102 { 2103 2104 ost->st_dev = st->st_dev; 2105 ost->st_ino = st->st_ino; 2106 if (ost->st_ino != st->st_ino) { 2107 switch (ino64_trunc_error) { 2108 default: 2109 case 0: 2110 break; 2111 case 1: 2112 return (EOVERFLOW); 2113 case 2: 2114 ost->st_ino = UINT32_MAX; 2115 break; 2116 } 2117 } 2118 ost->st_mode = st->st_mode; 2119 ost->st_nlink = st->st_nlink; 2120 if (ost->st_nlink != st->st_nlink) { 2121 switch (ino64_trunc_error) { 2122 default: 2123 case 0: 2124 break; 2125 case 1: 2126 return (EOVERFLOW); 2127 case 2: 2128 ost->st_nlink = UINT16_MAX; 2129 break; 2130 } 2131 } 2132 ost->st_uid = st->st_uid; 2133 ost->st_gid = st->st_gid; 2134 ost->st_rdev = st->st_rdev; 2135 ost->st_atim = st->st_atim; 2136 ost->st_mtim = st->st_mtim; 2137 ost->st_ctim = st->st_ctim; 2138 ost->st_size = st->st_size; 2139 ost->st_blocks = st->st_blocks; 2140 ost->st_blksize = st->st_blksize; 2141 ost->st_flags = st->st_flags; 2142 ost->st_gen = st->st_gen; 2143 ost->st_lspare = 0; 2144 ost->st_birthtim = st->st_birthtim; 2145 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2146 sizeof(*ost) - offsetof(struct freebsd11_stat, 2147 st_birthtim) - sizeof(ost->st_birthtim)); 2148 return (0); 2149 } 2150 2151 int 2152 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2153 { 2154 struct stat sb; 2155 struct freebsd11_stat osb; 2156 int error; 2157 2158 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2159 &sb, NULL); 2160 if (error != 0) 2161 return (error); 2162 error = freebsd11_cvtstat(&sb, &osb); 2163 if (error == 0) 2164 error = copyout(&osb, uap->ub, sizeof(osb)); 2165 return (error); 2166 } 2167 2168 int 2169 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2170 { 2171 struct stat sb; 2172 struct freebsd11_stat osb; 2173 int error; 2174 2175 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2176 UIO_USERSPACE, &sb, NULL); 2177 if (error != 0) 2178 return (error); 2179 error = freebsd11_cvtstat(&sb, &osb); 2180 if (error == 0) 2181 error = copyout(&osb, uap->ub, sizeof(osb)); 2182 return (error); 2183 } 2184 2185 int 2186 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2187 { 2188 struct fhandle fh; 2189 struct stat sb; 2190 struct freebsd11_stat osb; 2191 int error; 2192 2193 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2194 if (error != 0) 2195 return (error); 2196 error = kern_fhstat(td, fh, &sb); 2197 if (error != 0) 2198 return (error); 2199 error = freebsd11_cvtstat(&sb, &osb); 2200 if (error == 0) 2201 error = copyout(&osb, uap->sb, sizeof(osb)); 2202 return (error); 2203 } 2204 2205 int 2206 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2207 { 2208 struct stat sb; 2209 struct freebsd11_stat osb; 2210 int error; 2211 2212 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2213 UIO_USERSPACE, &sb, NULL); 2214 if (error != 0) 2215 return (error); 2216 error = freebsd11_cvtstat(&sb, &osb); 2217 if (error == 0) 2218 error = copyout(&osb, uap->buf, sizeof(osb)); 2219 return (error); 2220 } 2221 #endif /* COMPAT_FREEBSD11 */ 2222 2223 /* 2224 * Get file status 2225 */ 2226 #ifndef _SYS_SYSPROTO_H_ 2227 struct fstatat_args { 2228 int fd; 2229 char *path; 2230 struct stat *buf; 2231 int flag; 2232 } 2233 #endif 2234 int 2235 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2236 { 2237 struct stat sb; 2238 int error; 2239 2240 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2241 UIO_USERSPACE, &sb, NULL); 2242 if (error == 0) 2243 error = copyout(&sb, uap->buf, sizeof (sb)); 2244 return (error); 2245 } 2246 2247 int 2248 kern_statat(struct thread *td, int flag, int fd, char *path, 2249 enum uio_seg pathseg, struct stat *sbp, 2250 void (*hook)(struct vnode *vp, struct stat *sbp)) 2251 { 2252 struct nameidata nd; 2253 struct stat sb; 2254 int error; 2255 2256 if (flag & ~AT_SYMLINK_NOFOLLOW) 2257 return (EINVAL); 2258 2259 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 2260 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd, 2261 &cap_fstat_rights, td); 2262 2263 if ((error = namei(&nd)) != 0) 2264 return (error); 2265 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 2266 if (error == 0) { 2267 SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode); 2268 if (S_ISREG(sb.st_mode)) 2269 SDT_PROBE2(vfs, , stat, reg, path, pathseg); 2270 if (__predict_false(hook != NULL)) 2271 hook(nd.ni_vp, &sb); 2272 } 2273 NDFREE(&nd, NDF_ONLY_PNBUF); 2274 vput(nd.ni_vp); 2275 if (error != 0) 2276 return (error); 2277 #ifdef __STAT_TIME_T_EXT 2278 sb.st_atim_ext = 0; 2279 sb.st_mtim_ext = 0; 2280 sb.st_ctim_ext = 0; 2281 sb.st_btim_ext = 0; 2282 #endif 2283 *sbp = sb; 2284 #ifdef KTRACE 2285 if (KTRPOINT(td, KTR_STRUCT)) 2286 ktrstat(&sb); 2287 #endif 2288 return (0); 2289 } 2290 2291 #if defined(COMPAT_FREEBSD11) 2292 /* 2293 * Implementation of the NetBSD [l]stat() functions. 2294 */ 2295 void 2296 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2297 { 2298 2299 bzero(nsb, sizeof(*nsb)); 2300 nsb->st_dev = sb->st_dev; 2301 nsb->st_ino = sb->st_ino; 2302 nsb->st_mode = sb->st_mode; 2303 nsb->st_nlink = sb->st_nlink; 2304 nsb->st_uid = sb->st_uid; 2305 nsb->st_gid = sb->st_gid; 2306 nsb->st_rdev = sb->st_rdev; 2307 nsb->st_atim = sb->st_atim; 2308 nsb->st_mtim = sb->st_mtim; 2309 nsb->st_ctim = sb->st_ctim; 2310 nsb->st_size = sb->st_size; 2311 nsb->st_blocks = sb->st_blocks; 2312 nsb->st_blksize = sb->st_blksize; 2313 nsb->st_flags = sb->st_flags; 2314 nsb->st_gen = sb->st_gen; 2315 nsb->st_birthtim = sb->st_birthtim; 2316 } 2317 2318 #ifndef _SYS_SYSPROTO_H_ 2319 struct freebsd11_nstat_args { 2320 char *path; 2321 struct nstat *ub; 2322 }; 2323 #endif 2324 int 2325 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2326 { 2327 struct stat sb; 2328 struct nstat nsb; 2329 int error; 2330 2331 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2332 &sb, NULL); 2333 if (error != 0) 2334 return (error); 2335 freebsd11_cvtnstat(&sb, &nsb); 2336 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2337 } 2338 2339 /* 2340 * NetBSD lstat. Get file status; this version does not follow links. 2341 */ 2342 #ifndef _SYS_SYSPROTO_H_ 2343 struct freebsd11_nlstat_args { 2344 char *path; 2345 struct nstat *ub; 2346 }; 2347 #endif 2348 int 2349 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2350 { 2351 struct stat sb; 2352 struct nstat nsb; 2353 int error; 2354 2355 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2356 UIO_USERSPACE, &sb, NULL); 2357 if (error != 0) 2358 return (error); 2359 freebsd11_cvtnstat(&sb, &nsb); 2360 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2361 } 2362 #endif /* COMPAT_FREEBSD11 */ 2363 2364 /* 2365 * Get configurable pathname variables. 2366 */ 2367 #ifndef _SYS_SYSPROTO_H_ 2368 struct pathconf_args { 2369 char *path; 2370 int name; 2371 }; 2372 #endif 2373 int 2374 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2375 { 2376 long value; 2377 int error; 2378 2379 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2380 &value); 2381 if (error == 0) 2382 td->td_retval[0] = value; 2383 return (error); 2384 } 2385 2386 #ifndef _SYS_SYSPROTO_H_ 2387 struct lpathconf_args { 2388 char *path; 2389 int name; 2390 }; 2391 #endif 2392 int 2393 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2394 { 2395 long value; 2396 int error; 2397 2398 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2399 NOFOLLOW, &value); 2400 if (error == 0) 2401 td->td_retval[0] = value; 2402 return (error); 2403 } 2404 2405 int 2406 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name, 2407 u_long flags, long *valuep) 2408 { 2409 struct nameidata nd; 2410 int error; 2411 2412 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2413 pathseg, path, td); 2414 if ((error = namei(&nd)) != 0) 2415 return (error); 2416 NDFREE(&nd, NDF_ONLY_PNBUF); 2417 2418 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2419 vput(nd.ni_vp); 2420 return (error); 2421 } 2422 2423 /* 2424 * Return target name of a symbolic link. 2425 */ 2426 #ifndef _SYS_SYSPROTO_H_ 2427 struct readlink_args { 2428 char *path; 2429 char *buf; 2430 size_t count; 2431 }; 2432 #endif 2433 int 2434 sys_readlink(struct thread *td, struct readlink_args *uap) 2435 { 2436 2437 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2438 uap->buf, UIO_USERSPACE, uap->count)); 2439 } 2440 #ifndef _SYS_SYSPROTO_H_ 2441 struct readlinkat_args { 2442 int fd; 2443 char *path; 2444 char *buf; 2445 size_t bufsize; 2446 }; 2447 #endif 2448 int 2449 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2450 { 2451 2452 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2453 uap->buf, UIO_USERSPACE, uap->bufsize)); 2454 } 2455 2456 int 2457 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2458 char *buf, enum uio_seg bufseg, size_t count) 2459 { 2460 struct vnode *vp; 2461 struct iovec aiov; 2462 struct uio auio; 2463 struct nameidata nd; 2464 int error; 2465 2466 if (count > IOSIZE_MAX) 2467 return (EINVAL); 2468 2469 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2470 pathseg, path, fd, td); 2471 2472 if ((error = namei(&nd)) != 0) 2473 return (error); 2474 NDFREE(&nd, NDF_ONLY_PNBUF); 2475 vp = nd.ni_vp; 2476 #ifdef MAC 2477 error = mac_vnode_check_readlink(td->td_ucred, vp); 2478 if (error != 0) { 2479 vput(vp); 2480 return (error); 2481 } 2482 #endif 2483 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2484 error = EINVAL; 2485 else { 2486 aiov.iov_base = buf; 2487 aiov.iov_len = count; 2488 auio.uio_iov = &aiov; 2489 auio.uio_iovcnt = 1; 2490 auio.uio_offset = 0; 2491 auio.uio_rw = UIO_READ; 2492 auio.uio_segflg = bufseg; 2493 auio.uio_td = td; 2494 auio.uio_resid = count; 2495 error = VOP_READLINK(vp, &auio, td->td_ucred); 2496 td->td_retval[0] = count - auio.uio_resid; 2497 } 2498 vput(vp); 2499 return (error); 2500 } 2501 2502 /* 2503 * Common implementation code for chflags() and fchflags(). 2504 */ 2505 static int 2506 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2507 { 2508 struct mount *mp; 2509 struct vattr vattr; 2510 int error; 2511 2512 /* We can't support the value matching VNOVAL. */ 2513 if (flags == VNOVAL) 2514 return (EOPNOTSUPP); 2515 2516 /* 2517 * Prevent non-root users from setting flags on devices. When 2518 * a device is reused, users can retain ownership of the device 2519 * if they are allowed to set flags and programs assume that 2520 * chown can't fail when done as root. 2521 */ 2522 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2523 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2524 if (error != 0) 2525 return (error); 2526 } 2527 2528 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2529 return (error); 2530 VATTR_NULL(&vattr); 2531 vattr.va_flags = flags; 2532 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2533 #ifdef MAC 2534 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2535 if (error == 0) 2536 #endif 2537 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2538 VOP_UNLOCK(vp, 0); 2539 vn_finished_write(mp); 2540 return (error); 2541 } 2542 2543 /* 2544 * Change flags of a file given a path name. 2545 */ 2546 #ifndef _SYS_SYSPROTO_H_ 2547 struct chflags_args { 2548 const char *path; 2549 u_long flags; 2550 }; 2551 #endif 2552 int 2553 sys_chflags(struct thread *td, struct chflags_args *uap) 2554 { 2555 2556 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2557 uap->flags, 0)); 2558 } 2559 2560 #ifndef _SYS_SYSPROTO_H_ 2561 struct chflagsat_args { 2562 int fd; 2563 const char *path; 2564 u_long flags; 2565 int atflag; 2566 } 2567 #endif 2568 int 2569 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2570 { 2571 int fd = uap->fd; 2572 const char *path = uap->path; 2573 u_long flags = uap->flags; 2574 int atflag = uap->atflag; 2575 2576 if (atflag & ~AT_SYMLINK_NOFOLLOW) 2577 return (EINVAL); 2578 2579 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag)); 2580 } 2581 2582 /* 2583 * Same as chflags() but doesn't follow symlinks. 2584 */ 2585 #ifndef _SYS_SYSPROTO_H_ 2586 struct lchflags_args { 2587 const char *path; 2588 u_long flags; 2589 }; 2590 #endif 2591 int 2592 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2593 { 2594 2595 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2596 uap->flags, AT_SYMLINK_NOFOLLOW)); 2597 } 2598 2599 static int 2600 kern_chflagsat(struct thread *td, int fd, const char *path, 2601 enum uio_seg pathseg, u_long flags, int atflag) 2602 { 2603 struct nameidata nd; 2604 int error, follow; 2605 2606 AUDIT_ARG_FFLAGS(flags); 2607 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2608 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2609 &cap_fchflags_rights, td); 2610 if ((error = namei(&nd)) != 0) 2611 return (error); 2612 NDFREE(&nd, NDF_ONLY_PNBUF); 2613 error = setfflags(td, nd.ni_vp, flags); 2614 vrele(nd.ni_vp); 2615 return (error); 2616 } 2617 2618 /* 2619 * Change flags of a file given a file descriptor. 2620 */ 2621 #ifndef _SYS_SYSPROTO_H_ 2622 struct fchflags_args { 2623 int fd; 2624 u_long flags; 2625 }; 2626 #endif 2627 int 2628 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2629 { 2630 struct file *fp; 2631 int error; 2632 2633 AUDIT_ARG_FD(uap->fd); 2634 AUDIT_ARG_FFLAGS(uap->flags); 2635 error = getvnode(td, uap->fd, &cap_fchflags_rights, 2636 &fp); 2637 if (error != 0) 2638 return (error); 2639 #ifdef AUDIT 2640 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2641 AUDIT_ARG_VNODE1(fp->f_vnode); 2642 VOP_UNLOCK(fp->f_vnode, 0); 2643 #endif 2644 error = setfflags(td, fp->f_vnode, uap->flags); 2645 fdrop(fp, td); 2646 return (error); 2647 } 2648 2649 /* 2650 * Common implementation code for chmod(), lchmod() and fchmod(). 2651 */ 2652 int 2653 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2654 { 2655 struct mount *mp; 2656 struct vattr vattr; 2657 int error; 2658 2659 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2660 return (error); 2661 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2662 VATTR_NULL(&vattr); 2663 vattr.va_mode = mode & ALLPERMS; 2664 #ifdef MAC 2665 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2666 if (error == 0) 2667 #endif 2668 error = VOP_SETATTR(vp, &vattr, cred); 2669 VOP_UNLOCK(vp, 0); 2670 vn_finished_write(mp); 2671 return (error); 2672 } 2673 2674 /* 2675 * Change mode of a file given path name. 2676 */ 2677 #ifndef _SYS_SYSPROTO_H_ 2678 struct chmod_args { 2679 char *path; 2680 int mode; 2681 }; 2682 #endif 2683 int 2684 sys_chmod(struct thread *td, struct chmod_args *uap) 2685 { 2686 2687 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2688 uap->mode, 0)); 2689 } 2690 2691 #ifndef _SYS_SYSPROTO_H_ 2692 struct fchmodat_args { 2693 int dirfd; 2694 char *path; 2695 mode_t mode; 2696 int flag; 2697 } 2698 #endif 2699 int 2700 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2701 { 2702 int flag = uap->flag; 2703 int fd = uap->fd; 2704 char *path = uap->path; 2705 mode_t mode = uap->mode; 2706 2707 if (flag & ~AT_SYMLINK_NOFOLLOW) 2708 return (EINVAL); 2709 2710 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag)); 2711 } 2712 2713 /* 2714 * Change mode of a file given path name (don't follow links.) 2715 */ 2716 #ifndef _SYS_SYSPROTO_H_ 2717 struct lchmod_args { 2718 char *path; 2719 int mode; 2720 }; 2721 #endif 2722 int 2723 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2724 { 2725 2726 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2727 uap->mode, AT_SYMLINK_NOFOLLOW)); 2728 } 2729 2730 int 2731 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2732 mode_t mode, int flag) 2733 { 2734 struct nameidata nd; 2735 int error, follow; 2736 2737 AUDIT_ARG_MODE(mode); 2738 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2739 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2740 &cap_fchmod_rights, td); 2741 if ((error = namei(&nd)) != 0) 2742 return (error); 2743 NDFREE(&nd, NDF_ONLY_PNBUF); 2744 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2745 vrele(nd.ni_vp); 2746 return (error); 2747 } 2748 2749 /* 2750 * Change mode of a file given a file descriptor. 2751 */ 2752 #ifndef _SYS_SYSPROTO_H_ 2753 struct fchmod_args { 2754 int fd; 2755 int mode; 2756 }; 2757 #endif 2758 int 2759 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2760 { 2761 struct file *fp; 2762 int error; 2763 2764 AUDIT_ARG_FD(uap->fd); 2765 AUDIT_ARG_MODE(uap->mode); 2766 2767 error = fget(td, uap->fd, &cap_fchmod_rights, &fp); 2768 if (error != 0) 2769 return (error); 2770 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2771 fdrop(fp, td); 2772 return (error); 2773 } 2774 2775 /* 2776 * Common implementation for chown(), lchown(), and fchown() 2777 */ 2778 int 2779 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2780 gid_t gid) 2781 { 2782 struct mount *mp; 2783 struct vattr vattr; 2784 int error; 2785 2786 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2787 return (error); 2788 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2789 VATTR_NULL(&vattr); 2790 vattr.va_uid = uid; 2791 vattr.va_gid = gid; 2792 #ifdef MAC 2793 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2794 vattr.va_gid); 2795 if (error == 0) 2796 #endif 2797 error = VOP_SETATTR(vp, &vattr, cred); 2798 VOP_UNLOCK(vp, 0); 2799 vn_finished_write(mp); 2800 return (error); 2801 } 2802 2803 /* 2804 * Set ownership given a path name. 2805 */ 2806 #ifndef _SYS_SYSPROTO_H_ 2807 struct chown_args { 2808 char *path; 2809 int uid; 2810 int gid; 2811 }; 2812 #endif 2813 int 2814 sys_chown(struct thread *td, struct chown_args *uap) 2815 { 2816 2817 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2818 uap->gid, 0)); 2819 } 2820 2821 #ifndef _SYS_SYSPROTO_H_ 2822 struct fchownat_args { 2823 int fd; 2824 const char * path; 2825 uid_t uid; 2826 gid_t gid; 2827 int flag; 2828 }; 2829 #endif 2830 int 2831 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2832 { 2833 int flag; 2834 2835 flag = uap->flag; 2836 if (flag & ~AT_SYMLINK_NOFOLLOW) 2837 return (EINVAL); 2838 2839 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 2840 uap->gid, uap->flag)); 2841 } 2842 2843 int 2844 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2845 int uid, int gid, int flag) 2846 { 2847 struct nameidata nd; 2848 int error, follow; 2849 2850 AUDIT_ARG_OWNER(uid, gid); 2851 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2852 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2853 &cap_fchown_rights, td); 2854 2855 if ((error = namei(&nd)) != 0) 2856 return (error); 2857 NDFREE(&nd, NDF_ONLY_PNBUF); 2858 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 2859 vrele(nd.ni_vp); 2860 return (error); 2861 } 2862 2863 /* 2864 * Set ownership given a path name, do not cross symlinks. 2865 */ 2866 #ifndef _SYS_SYSPROTO_H_ 2867 struct lchown_args { 2868 char *path; 2869 int uid; 2870 int gid; 2871 }; 2872 #endif 2873 int 2874 sys_lchown(struct thread *td, struct lchown_args *uap) 2875 { 2876 2877 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2878 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 2879 } 2880 2881 /* 2882 * Set ownership given a file descriptor. 2883 */ 2884 #ifndef _SYS_SYSPROTO_H_ 2885 struct fchown_args { 2886 int fd; 2887 int uid; 2888 int gid; 2889 }; 2890 #endif 2891 int 2892 sys_fchown(struct thread *td, struct fchown_args *uap) 2893 { 2894 struct file *fp; 2895 int error; 2896 2897 AUDIT_ARG_FD(uap->fd); 2898 AUDIT_ARG_OWNER(uap->uid, uap->gid); 2899 error = fget(td, uap->fd, &cap_fchown_rights, &fp); 2900 if (error != 0) 2901 return (error); 2902 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 2903 fdrop(fp, td); 2904 return (error); 2905 } 2906 2907 /* 2908 * Common implementation code for utimes(), lutimes(), and futimes(). 2909 */ 2910 static int 2911 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 2912 struct timespec *tsp) 2913 { 2914 struct timeval tv[2]; 2915 const struct timeval *tvp; 2916 int error; 2917 2918 if (usrtvp == NULL) { 2919 vfs_timestamp(&tsp[0]); 2920 tsp[1] = tsp[0]; 2921 } else { 2922 if (tvpseg == UIO_SYSSPACE) { 2923 tvp = usrtvp; 2924 } else { 2925 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 2926 return (error); 2927 tvp = tv; 2928 } 2929 2930 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 2931 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 2932 return (EINVAL); 2933 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 2934 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 2935 } 2936 return (0); 2937 } 2938 2939 /* 2940 * Common implementation code for futimens(), utimensat(). 2941 */ 2942 #define UTIMENS_NULL 0x1 2943 #define UTIMENS_EXIT 0x2 2944 static int 2945 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 2946 struct timespec *tsp, int *retflags) 2947 { 2948 struct timespec tsnow; 2949 int error; 2950 2951 vfs_timestamp(&tsnow); 2952 *retflags = 0; 2953 if (usrtsp == NULL) { 2954 tsp[0] = tsnow; 2955 tsp[1] = tsnow; 2956 *retflags |= UTIMENS_NULL; 2957 return (0); 2958 } 2959 if (tspseg == UIO_SYSSPACE) { 2960 tsp[0] = usrtsp[0]; 2961 tsp[1] = usrtsp[1]; 2962 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 2963 return (error); 2964 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 2965 *retflags |= UTIMENS_EXIT; 2966 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 2967 *retflags |= UTIMENS_NULL; 2968 if (tsp[0].tv_nsec == UTIME_OMIT) 2969 tsp[0].tv_sec = VNOVAL; 2970 else if (tsp[0].tv_nsec == UTIME_NOW) 2971 tsp[0] = tsnow; 2972 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 2973 return (EINVAL); 2974 if (tsp[1].tv_nsec == UTIME_OMIT) 2975 tsp[1].tv_sec = VNOVAL; 2976 else if (tsp[1].tv_nsec == UTIME_NOW) 2977 tsp[1] = tsnow; 2978 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 2979 return (EINVAL); 2980 2981 return (0); 2982 } 2983 2984 /* 2985 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 2986 * and utimensat(). 2987 */ 2988 static int 2989 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 2990 int numtimes, int nullflag) 2991 { 2992 struct mount *mp; 2993 struct vattr vattr; 2994 int error, setbirthtime; 2995 2996 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2997 return (error); 2998 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2999 setbirthtime = 0; 3000 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3001 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3002 setbirthtime = 1; 3003 VATTR_NULL(&vattr); 3004 vattr.va_atime = ts[0]; 3005 vattr.va_mtime = ts[1]; 3006 if (setbirthtime) 3007 vattr.va_birthtime = ts[1]; 3008 if (numtimes > 2) 3009 vattr.va_birthtime = ts[2]; 3010 if (nullflag) 3011 vattr.va_vaflags |= VA_UTIMES_NULL; 3012 #ifdef MAC 3013 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3014 vattr.va_mtime); 3015 #endif 3016 if (error == 0) 3017 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3018 VOP_UNLOCK(vp, 0); 3019 vn_finished_write(mp); 3020 return (error); 3021 } 3022 3023 /* 3024 * Set the access and modification times of a file. 3025 */ 3026 #ifndef _SYS_SYSPROTO_H_ 3027 struct utimes_args { 3028 char *path; 3029 struct timeval *tptr; 3030 }; 3031 #endif 3032 int 3033 sys_utimes(struct thread *td, struct utimes_args *uap) 3034 { 3035 3036 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3037 uap->tptr, UIO_USERSPACE)); 3038 } 3039 3040 #ifndef _SYS_SYSPROTO_H_ 3041 struct futimesat_args { 3042 int fd; 3043 const char * path; 3044 const struct timeval * times; 3045 }; 3046 #endif 3047 int 3048 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3049 { 3050 3051 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3052 uap->times, UIO_USERSPACE)); 3053 } 3054 3055 int 3056 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3057 struct timeval *tptr, enum uio_seg tptrseg) 3058 { 3059 struct nameidata nd; 3060 struct timespec ts[2]; 3061 int error; 3062 3063 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3064 return (error); 3065 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3066 &cap_futimes_rights, td); 3067 3068 if ((error = namei(&nd)) != 0) 3069 return (error); 3070 NDFREE(&nd, NDF_ONLY_PNBUF); 3071 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3072 vrele(nd.ni_vp); 3073 return (error); 3074 } 3075 3076 /* 3077 * Set the access and modification times of a file. 3078 */ 3079 #ifndef _SYS_SYSPROTO_H_ 3080 struct lutimes_args { 3081 char *path; 3082 struct timeval *tptr; 3083 }; 3084 #endif 3085 int 3086 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3087 { 3088 3089 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3090 UIO_USERSPACE)); 3091 } 3092 3093 int 3094 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, 3095 struct timeval *tptr, enum uio_seg tptrseg) 3096 { 3097 struct timespec ts[2]; 3098 struct nameidata nd; 3099 int error; 3100 3101 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3102 return (error); 3103 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3104 if ((error = namei(&nd)) != 0) 3105 return (error); 3106 NDFREE(&nd, NDF_ONLY_PNBUF); 3107 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3108 vrele(nd.ni_vp); 3109 return (error); 3110 } 3111 3112 /* 3113 * Set the access and modification times of a file. 3114 */ 3115 #ifndef _SYS_SYSPROTO_H_ 3116 struct futimes_args { 3117 int fd; 3118 struct timeval *tptr; 3119 }; 3120 #endif 3121 int 3122 sys_futimes(struct thread *td, struct futimes_args *uap) 3123 { 3124 3125 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3126 } 3127 3128 int 3129 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3130 enum uio_seg tptrseg) 3131 { 3132 struct timespec ts[2]; 3133 struct file *fp; 3134 int error; 3135 3136 AUDIT_ARG_FD(fd); 3137 error = getutimes(tptr, tptrseg, ts); 3138 if (error != 0) 3139 return (error); 3140 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3141 if (error != 0) 3142 return (error); 3143 #ifdef AUDIT 3144 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3145 AUDIT_ARG_VNODE1(fp->f_vnode); 3146 VOP_UNLOCK(fp->f_vnode, 0); 3147 #endif 3148 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3149 fdrop(fp, td); 3150 return (error); 3151 } 3152 3153 int 3154 sys_futimens(struct thread *td, struct futimens_args *uap) 3155 { 3156 3157 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3158 } 3159 3160 int 3161 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3162 enum uio_seg tptrseg) 3163 { 3164 struct timespec ts[2]; 3165 struct file *fp; 3166 int error, flags; 3167 3168 AUDIT_ARG_FD(fd); 3169 error = getutimens(tptr, tptrseg, ts, &flags); 3170 if (error != 0) 3171 return (error); 3172 if (flags & UTIMENS_EXIT) 3173 return (0); 3174 error = getvnode(td, fd, &cap_futimes_rights, &fp); 3175 if (error != 0) 3176 return (error); 3177 #ifdef AUDIT 3178 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3179 AUDIT_ARG_VNODE1(fp->f_vnode); 3180 VOP_UNLOCK(fp->f_vnode, 0); 3181 #endif 3182 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3183 fdrop(fp, td); 3184 return (error); 3185 } 3186 3187 int 3188 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3189 { 3190 3191 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3192 uap->times, UIO_USERSPACE, uap->flag)); 3193 } 3194 3195 int 3196 kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3197 struct timespec *tptr, enum uio_seg tptrseg, int flag) 3198 { 3199 struct nameidata nd; 3200 struct timespec ts[2]; 3201 int error, flags; 3202 3203 if (flag & ~AT_SYMLINK_NOFOLLOW) 3204 return (EINVAL); 3205 3206 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3207 return (error); 3208 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 3209 FOLLOW) | AUDITVNODE1, pathseg, path, fd, 3210 &cap_futimes_rights, td); 3211 if ((error = namei(&nd)) != 0) 3212 return (error); 3213 /* 3214 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3215 * POSIX states: 3216 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3217 * "Search permission is denied by a component of the path prefix." 3218 */ 3219 NDFREE(&nd, NDF_ONLY_PNBUF); 3220 if ((flags & UTIMENS_EXIT) == 0) 3221 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3222 vrele(nd.ni_vp); 3223 return (error); 3224 } 3225 3226 /* 3227 * Truncate a file given its path name. 3228 */ 3229 #ifndef _SYS_SYSPROTO_H_ 3230 struct truncate_args { 3231 char *path; 3232 int pad; 3233 off_t length; 3234 }; 3235 #endif 3236 int 3237 sys_truncate(struct thread *td, struct truncate_args *uap) 3238 { 3239 3240 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3241 } 3242 3243 int 3244 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) 3245 { 3246 struct mount *mp; 3247 struct vnode *vp; 3248 void *rl_cookie; 3249 struct vattr vattr; 3250 struct nameidata nd; 3251 int error; 3252 3253 if (length < 0) 3254 return(EINVAL); 3255 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3256 if ((error = namei(&nd)) != 0) 3257 return (error); 3258 vp = nd.ni_vp; 3259 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3260 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3261 vn_rangelock_unlock(vp, rl_cookie); 3262 vrele(vp); 3263 return (error); 3264 } 3265 NDFREE(&nd, NDF_ONLY_PNBUF); 3266 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3267 if (vp->v_type == VDIR) 3268 error = EISDIR; 3269 #ifdef MAC 3270 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3271 } 3272 #endif 3273 else if ((error = vn_writechk(vp)) == 0 && 3274 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3275 VATTR_NULL(&vattr); 3276 vattr.va_size = length; 3277 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3278 } 3279 VOP_UNLOCK(vp, 0); 3280 vn_finished_write(mp); 3281 vn_rangelock_unlock(vp, rl_cookie); 3282 vrele(vp); 3283 return (error); 3284 } 3285 3286 #if defined(COMPAT_43) 3287 /* 3288 * Truncate a file given its path name. 3289 */ 3290 #ifndef _SYS_SYSPROTO_H_ 3291 struct otruncate_args { 3292 char *path; 3293 long length; 3294 }; 3295 #endif 3296 int 3297 otruncate(struct thread *td, struct otruncate_args *uap) 3298 { 3299 3300 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3301 } 3302 #endif /* COMPAT_43 */ 3303 3304 #if defined(COMPAT_FREEBSD6) 3305 /* Versions with the pad argument */ 3306 int 3307 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3308 { 3309 3310 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3311 } 3312 3313 int 3314 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3315 { 3316 3317 return (kern_ftruncate(td, uap->fd, uap->length)); 3318 } 3319 #endif 3320 3321 int 3322 kern_fsync(struct thread *td, int fd, bool fullsync) 3323 { 3324 struct vnode *vp; 3325 struct mount *mp; 3326 struct file *fp; 3327 int error, lock_flags; 3328 3329 AUDIT_ARG_FD(fd); 3330 error = getvnode(td, fd, &cap_fsync_rights, &fp); 3331 if (error != 0) 3332 return (error); 3333 vp = fp->f_vnode; 3334 #if 0 3335 if (!fullsync) 3336 /* XXXKIB: compete outstanding aio writes */; 3337 #endif 3338 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3339 if (error != 0) 3340 goto drop; 3341 if (MNT_SHARED_WRITES(mp) || 3342 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3343 lock_flags = LK_SHARED; 3344 } else { 3345 lock_flags = LK_EXCLUSIVE; 3346 } 3347 vn_lock(vp, lock_flags | LK_RETRY); 3348 AUDIT_ARG_VNODE1(vp); 3349 if (vp->v_object != NULL) { 3350 VM_OBJECT_WLOCK(vp->v_object); 3351 vm_object_page_clean(vp->v_object, 0, 0, 0); 3352 VM_OBJECT_WUNLOCK(vp->v_object); 3353 } 3354 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3355 VOP_UNLOCK(vp, 0); 3356 vn_finished_write(mp); 3357 drop: 3358 fdrop(fp, td); 3359 return (error); 3360 } 3361 3362 /* 3363 * Sync an open file. 3364 */ 3365 #ifndef _SYS_SYSPROTO_H_ 3366 struct fsync_args { 3367 int fd; 3368 }; 3369 #endif 3370 int 3371 sys_fsync(struct thread *td, struct fsync_args *uap) 3372 { 3373 3374 return (kern_fsync(td, uap->fd, true)); 3375 } 3376 3377 int 3378 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3379 { 3380 3381 return (kern_fsync(td, uap->fd, false)); 3382 } 3383 3384 /* 3385 * Rename files. Source and destination must either both be directories, or 3386 * both not be directories. If target is a directory, it must be empty. 3387 */ 3388 #ifndef _SYS_SYSPROTO_H_ 3389 struct rename_args { 3390 char *from; 3391 char *to; 3392 }; 3393 #endif 3394 int 3395 sys_rename(struct thread *td, struct rename_args *uap) 3396 { 3397 3398 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3399 uap->to, UIO_USERSPACE)); 3400 } 3401 3402 #ifndef _SYS_SYSPROTO_H_ 3403 struct renameat_args { 3404 int oldfd; 3405 char *old; 3406 int newfd; 3407 char *new; 3408 }; 3409 #endif 3410 int 3411 sys_renameat(struct thread *td, struct renameat_args *uap) 3412 { 3413 3414 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3415 UIO_USERSPACE)); 3416 } 3417 3418 int 3419 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new, 3420 enum uio_seg pathseg) 3421 { 3422 struct mount *mp = NULL; 3423 struct vnode *tvp, *fvp, *tdvp; 3424 struct nameidata fromnd, tond; 3425 int error; 3426 3427 again: 3428 bwillwrite(); 3429 #ifdef MAC 3430 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3431 AUDITVNODE1, pathseg, old, oldfd, 3432 &cap_renameat_source_rights, td); 3433 #else 3434 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3435 pathseg, old, oldfd, 3436 &cap_renameat_source_rights, td); 3437 #endif 3438 3439 if ((error = namei(&fromnd)) != 0) 3440 return (error); 3441 #ifdef MAC 3442 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3443 fromnd.ni_vp, &fromnd.ni_cnd); 3444 VOP_UNLOCK(fromnd.ni_dvp, 0); 3445 if (fromnd.ni_dvp != fromnd.ni_vp) 3446 VOP_UNLOCK(fromnd.ni_vp, 0); 3447 #endif 3448 fvp = fromnd.ni_vp; 3449 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3450 SAVESTART | AUDITVNODE2, pathseg, new, newfd, 3451 &cap_renameat_target_rights, td); 3452 if (fromnd.ni_vp->v_type == VDIR) 3453 tond.ni_cnd.cn_flags |= WILLBEDIR; 3454 if ((error = namei(&tond)) != 0) { 3455 /* Translate error code for rename("dir1", "dir2/."). */ 3456 if (error == EISDIR && fvp->v_type == VDIR) 3457 error = EINVAL; 3458 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3459 vrele(fromnd.ni_dvp); 3460 vrele(fvp); 3461 goto out1; 3462 } 3463 tdvp = tond.ni_dvp; 3464 tvp = tond.ni_vp; 3465 error = vn_start_write(fvp, &mp, V_NOWAIT); 3466 if (error != 0) { 3467 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3468 NDFREE(&tond, NDF_ONLY_PNBUF); 3469 if (tvp != NULL) 3470 vput(tvp); 3471 if (tdvp == tvp) 3472 vrele(tdvp); 3473 else 3474 vput(tdvp); 3475 vrele(fromnd.ni_dvp); 3476 vrele(fvp); 3477 vrele(tond.ni_startdir); 3478 if (fromnd.ni_startdir != NULL) 3479 vrele(fromnd.ni_startdir); 3480 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3481 if (error != 0) 3482 return (error); 3483 goto again; 3484 } 3485 if (tvp != NULL) { 3486 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3487 error = ENOTDIR; 3488 goto out; 3489 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3490 error = EISDIR; 3491 goto out; 3492 } 3493 #ifdef CAPABILITIES 3494 if (newfd != AT_FDCWD) { 3495 /* 3496 * If the target already exists we require CAP_UNLINKAT 3497 * from 'newfd'. 3498 */ 3499 error = cap_check(&tond.ni_filecaps.fc_rights, 3500 &cap_unlinkat_rights); 3501 if (error != 0) 3502 goto out; 3503 } 3504 #endif 3505 } 3506 if (fvp == tdvp) { 3507 error = EINVAL; 3508 goto out; 3509 } 3510 /* 3511 * If the source is the same as the destination (that is, if they 3512 * are links to the same vnode), then there is nothing to do. 3513 */ 3514 if (fvp == tvp) 3515 error = -1; 3516 #ifdef MAC 3517 else 3518 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3519 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3520 #endif 3521 out: 3522 if (error == 0) { 3523 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3524 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3525 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3526 NDFREE(&tond, NDF_ONLY_PNBUF); 3527 } else { 3528 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3529 NDFREE(&tond, NDF_ONLY_PNBUF); 3530 if (tvp != NULL) 3531 vput(tvp); 3532 if (tdvp == tvp) 3533 vrele(tdvp); 3534 else 3535 vput(tdvp); 3536 vrele(fromnd.ni_dvp); 3537 vrele(fvp); 3538 } 3539 vrele(tond.ni_startdir); 3540 vn_finished_write(mp); 3541 out1: 3542 if (fromnd.ni_startdir) 3543 vrele(fromnd.ni_startdir); 3544 if (error == -1) 3545 return (0); 3546 return (error); 3547 } 3548 3549 /* 3550 * Make a directory file. 3551 */ 3552 #ifndef _SYS_SYSPROTO_H_ 3553 struct mkdir_args { 3554 char *path; 3555 int mode; 3556 }; 3557 #endif 3558 int 3559 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3560 { 3561 3562 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3563 uap->mode)); 3564 } 3565 3566 #ifndef _SYS_SYSPROTO_H_ 3567 struct mkdirat_args { 3568 int fd; 3569 char *path; 3570 mode_t mode; 3571 }; 3572 #endif 3573 int 3574 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3575 { 3576 3577 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3578 } 3579 3580 int 3581 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg, 3582 int mode) 3583 { 3584 struct mount *mp; 3585 struct vnode *vp; 3586 struct vattr vattr; 3587 struct nameidata nd; 3588 int error; 3589 3590 AUDIT_ARG_MODE(mode); 3591 restart: 3592 bwillwrite(); 3593 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3594 NOCACHE, segflg, path, fd, &cap_mkdirat_rights, 3595 td); 3596 nd.ni_cnd.cn_flags |= WILLBEDIR; 3597 if ((error = namei(&nd)) != 0) 3598 return (error); 3599 vp = nd.ni_vp; 3600 if (vp != NULL) { 3601 NDFREE(&nd, NDF_ONLY_PNBUF); 3602 /* 3603 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3604 * the strange behaviour of leaving the vnode unlocked 3605 * if the target is the same vnode as the parent. 3606 */ 3607 if (vp == nd.ni_dvp) 3608 vrele(nd.ni_dvp); 3609 else 3610 vput(nd.ni_dvp); 3611 vrele(vp); 3612 return (EEXIST); 3613 } 3614 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3615 NDFREE(&nd, NDF_ONLY_PNBUF); 3616 vput(nd.ni_dvp); 3617 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3618 return (error); 3619 goto restart; 3620 } 3621 VATTR_NULL(&vattr); 3622 vattr.va_type = VDIR; 3623 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3624 #ifdef MAC 3625 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3626 &vattr); 3627 if (error != 0) 3628 goto out; 3629 #endif 3630 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3631 #ifdef MAC 3632 out: 3633 #endif 3634 NDFREE(&nd, NDF_ONLY_PNBUF); 3635 vput(nd.ni_dvp); 3636 if (error == 0) 3637 vput(nd.ni_vp); 3638 vn_finished_write(mp); 3639 return (error); 3640 } 3641 3642 /* 3643 * Remove a directory file. 3644 */ 3645 #ifndef _SYS_SYSPROTO_H_ 3646 struct rmdir_args { 3647 char *path; 3648 }; 3649 #endif 3650 int 3651 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3652 { 3653 3654 return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE)); 3655 } 3656 3657 int 3658 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg) 3659 { 3660 struct mount *mp; 3661 struct vnode *vp; 3662 struct nameidata nd; 3663 int error; 3664 3665 restart: 3666 bwillwrite(); 3667 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, 3668 pathseg, path, fd, &cap_unlinkat_rights, td); 3669 if ((error = namei(&nd)) != 0) 3670 return (error); 3671 vp = nd.ni_vp; 3672 if (vp->v_type != VDIR) { 3673 error = ENOTDIR; 3674 goto out; 3675 } 3676 /* 3677 * No rmdir "." please. 3678 */ 3679 if (nd.ni_dvp == vp) { 3680 error = EINVAL; 3681 goto out; 3682 } 3683 /* 3684 * The root of a mounted filesystem cannot be deleted. 3685 */ 3686 if (vp->v_vflag & VV_ROOT) { 3687 error = EBUSY; 3688 goto out; 3689 } 3690 #ifdef MAC 3691 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3692 &nd.ni_cnd); 3693 if (error != 0) 3694 goto out; 3695 #endif 3696 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3697 NDFREE(&nd, NDF_ONLY_PNBUF); 3698 vput(vp); 3699 if (nd.ni_dvp == vp) 3700 vrele(nd.ni_dvp); 3701 else 3702 vput(nd.ni_dvp); 3703 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3704 return (error); 3705 goto restart; 3706 } 3707 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3708 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3709 vn_finished_write(mp); 3710 out: 3711 NDFREE(&nd, NDF_ONLY_PNBUF); 3712 vput(vp); 3713 if (nd.ni_dvp == vp) 3714 vrele(nd.ni_dvp); 3715 else 3716 vput(nd.ni_dvp); 3717 return (error); 3718 } 3719 3720 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3721 int 3722 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3723 long *basep, void (*func)(struct freebsd11_dirent *)) 3724 { 3725 struct freebsd11_dirent dstdp; 3726 struct dirent *dp, *edp; 3727 char *dirbuf; 3728 off_t base; 3729 ssize_t resid, ucount; 3730 int error; 3731 3732 /* XXX arbitrary sanity limit on `count'. */ 3733 count = min(count, 64 * 1024); 3734 3735 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3736 3737 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3738 UIO_SYSSPACE); 3739 if (error != 0) 3740 goto done; 3741 if (basep != NULL) 3742 *basep = base; 3743 3744 ucount = 0; 3745 for (dp = (struct dirent *)dirbuf, 3746 edp = (struct dirent *)&dirbuf[count - resid]; 3747 ucount < count && dp < edp; ) { 3748 if (dp->d_reclen == 0) 3749 break; 3750 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3751 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3752 continue; 3753 dstdp.d_type = dp->d_type; 3754 dstdp.d_namlen = dp->d_namlen; 3755 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3756 if (dstdp.d_fileno != dp->d_fileno) { 3757 switch (ino64_trunc_error) { 3758 default: 3759 case 0: 3760 break; 3761 case 1: 3762 error = EOVERFLOW; 3763 goto done; 3764 case 2: 3765 dstdp.d_fileno = UINT32_MAX; 3766 break; 3767 } 3768 } 3769 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3770 ((dp->d_namlen + 1 + 3) &~ 3); 3771 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3772 bzero(dstdp.d_name + dstdp.d_namlen, 3773 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3774 dstdp.d_namlen); 3775 MPASS(dstdp.d_reclen <= dp->d_reclen); 3776 MPASS(ucount + dstdp.d_reclen <= count); 3777 if (func != NULL) 3778 func(&dstdp); 3779 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3780 if (error != 0) 3781 break; 3782 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3783 ucount += dstdp.d_reclen; 3784 } 3785 3786 done: 3787 free(dirbuf, M_TEMP); 3788 if (error == 0) 3789 td->td_retval[0] = ucount; 3790 return (error); 3791 } 3792 #endif /* COMPAT */ 3793 3794 #ifdef COMPAT_43 3795 static void 3796 ogetdirentries_cvt(struct freebsd11_dirent *dp) 3797 { 3798 #if (BYTE_ORDER == LITTLE_ENDIAN) 3799 /* 3800 * The expected low byte of dp->d_namlen is our dp->d_type. 3801 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 3802 */ 3803 dp->d_type = dp->d_namlen; 3804 dp->d_namlen = 0; 3805 #else 3806 /* 3807 * The dp->d_type is the high byte of the expected dp->d_namlen, 3808 * so must be zero'ed. 3809 */ 3810 dp->d_type = 0; 3811 #endif 3812 } 3813 3814 /* 3815 * Read a block of directory entries in a filesystem independent format. 3816 */ 3817 #ifndef _SYS_SYSPROTO_H_ 3818 struct ogetdirentries_args { 3819 int fd; 3820 char *buf; 3821 u_int count; 3822 long *basep; 3823 }; 3824 #endif 3825 int 3826 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3827 { 3828 long loff; 3829 int error; 3830 3831 error = kern_ogetdirentries(td, uap, &loff); 3832 if (error == 0) 3833 error = copyout(&loff, uap->basep, sizeof(long)); 3834 return (error); 3835 } 3836 3837 int 3838 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3839 long *ploff) 3840 { 3841 long base; 3842 int error; 3843 3844 /* XXX arbitrary sanity limit on `count'. */ 3845 if (uap->count > 64 * 1024) 3846 return (EINVAL); 3847 3848 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3849 &base, ogetdirentries_cvt); 3850 3851 if (error == 0 && uap->basep != NULL) 3852 error = copyout(&base, uap->basep, sizeof(long)); 3853 3854 return (error); 3855 } 3856 #endif /* COMPAT_43 */ 3857 3858 #if defined(COMPAT_FREEBSD11) 3859 #ifndef _SYS_SYSPROTO_H_ 3860 struct freebsd11_getdirentries_args { 3861 int fd; 3862 char *buf; 3863 u_int count; 3864 long *basep; 3865 }; 3866 #endif 3867 int 3868 freebsd11_getdirentries(struct thread *td, 3869 struct freebsd11_getdirentries_args *uap) 3870 { 3871 long base; 3872 int error; 3873 3874 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3875 &base, NULL); 3876 3877 if (error == 0 && uap->basep != NULL) 3878 error = copyout(&base, uap->basep, sizeof(long)); 3879 return (error); 3880 } 3881 3882 int 3883 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 3884 { 3885 struct freebsd11_getdirentries_args ap; 3886 3887 ap.fd = uap->fd; 3888 ap.buf = uap->buf; 3889 ap.count = uap->count; 3890 ap.basep = NULL; 3891 return (freebsd11_getdirentries(td, &ap)); 3892 } 3893 #endif /* COMPAT_FREEBSD11 */ 3894 3895 /* 3896 * Read a block of directory entries in a filesystem independent format. 3897 */ 3898 int 3899 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 3900 { 3901 off_t base; 3902 int error; 3903 3904 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 3905 NULL, UIO_USERSPACE); 3906 if (error != 0) 3907 return (error); 3908 if (uap->basep != NULL) 3909 error = copyout(&base, uap->basep, sizeof(off_t)); 3910 return (error); 3911 } 3912 3913 int 3914 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 3915 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 3916 { 3917 struct vnode *vp; 3918 struct file *fp; 3919 struct uio auio; 3920 struct iovec aiov; 3921 off_t loff; 3922 int error, eofflag; 3923 off_t foffset; 3924 3925 AUDIT_ARG_FD(fd); 3926 if (count > IOSIZE_MAX) 3927 return (EINVAL); 3928 auio.uio_resid = count; 3929 error = getvnode(td, fd, &cap_read_rights, &fp); 3930 if (error != 0) 3931 return (error); 3932 if ((fp->f_flag & FREAD) == 0) { 3933 fdrop(fp, td); 3934 return (EBADF); 3935 } 3936 vp = fp->f_vnode; 3937 foffset = foffset_lock(fp, 0); 3938 unionread: 3939 if (vp->v_type != VDIR) { 3940 error = EINVAL; 3941 goto fail; 3942 } 3943 aiov.iov_base = buf; 3944 aiov.iov_len = count; 3945 auio.uio_iov = &aiov; 3946 auio.uio_iovcnt = 1; 3947 auio.uio_rw = UIO_READ; 3948 auio.uio_segflg = bufseg; 3949 auio.uio_td = td; 3950 vn_lock(vp, LK_SHARED | LK_RETRY); 3951 AUDIT_ARG_VNODE1(vp); 3952 loff = auio.uio_offset = foffset; 3953 #ifdef MAC 3954 error = mac_vnode_check_readdir(td->td_ucred, vp); 3955 if (error == 0) 3956 #endif 3957 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 3958 NULL); 3959 foffset = auio.uio_offset; 3960 if (error != 0) { 3961 VOP_UNLOCK(vp, 0); 3962 goto fail; 3963 } 3964 if (count == auio.uio_resid && 3965 (vp->v_vflag & VV_ROOT) && 3966 (vp->v_mount->mnt_flag & MNT_UNION)) { 3967 struct vnode *tvp = vp; 3968 3969 vp = vp->v_mount->mnt_vnodecovered; 3970 VREF(vp); 3971 fp->f_vnode = vp; 3972 fp->f_data = vp; 3973 foffset = 0; 3974 vput(tvp); 3975 goto unionread; 3976 } 3977 VOP_UNLOCK(vp, 0); 3978 *basep = loff; 3979 if (residp != NULL) 3980 *residp = auio.uio_resid; 3981 td->td_retval[0] = count - auio.uio_resid; 3982 fail: 3983 foffset_unlock(fp, foffset, 0); 3984 fdrop(fp, td); 3985 return (error); 3986 } 3987 3988 /* 3989 * Set the mode mask for creation of filesystem nodes. 3990 */ 3991 #ifndef _SYS_SYSPROTO_H_ 3992 struct umask_args { 3993 int newmask; 3994 }; 3995 #endif 3996 int 3997 sys_umask(struct thread *td, struct umask_args *uap) 3998 { 3999 struct filedesc *fdp; 4000 4001 fdp = td->td_proc->p_fd; 4002 FILEDESC_XLOCK(fdp); 4003 td->td_retval[0] = fdp->fd_cmask; 4004 fdp->fd_cmask = uap->newmask & ALLPERMS; 4005 FILEDESC_XUNLOCK(fdp); 4006 return (0); 4007 } 4008 4009 /* 4010 * Void all references to file by ripping underlying filesystem away from 4011 * vnode. 4012 */ 4013 #ifndef _SYS_SYSPROTO_H_ 4014 struct revoke_args { 4015 char *path; 4016 }; 4017 #endif 4018 int 4019 sys_revoke(struct thread *td, struct revoke_args *uap) 4020 { 4021 struct vnode *vp; 4022 struct vattr vattr; 4023 struct nameidata nd; 4024 int error; 4025 4026 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4027 uap->path, td); 4028 if ((error = namei(&nd)) != 0) 4029 return (error); 4030 vp = nd.ni_vp; 4031 NDFREE(&nd, NDF_ONLY_PNBUF); 4032 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4033 error = EINVAL; 4034 goto out; 4035 } 4036 #ifdef MAC 4037 error = mac_vnode_check_revoke(td->td_ucred, vp); 4038 if (error != 0) 4039 goto out; 4040 #endif 4041 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4042 if (error != 0) 4043 goto out; 4044 if (td->td_ucred->cr_uid != vattr.va_uid) { 4045 error = priv_check(td, PRIV_VFS_ADMIN); 4046 if (error != 0) 4047 goto out; 4048 } 4049 if (vcount(vp) > 1) 4050 VOP_REVOKE(vp, REVOKEALL); 4051 out: 4052 vput(vp); 4053 return (error); 4054 } 4055 4056 /* 4057 * Convert a user file descriptor to a kernel file entry and check that, if it 4058 * is a capability, the correct rights are present. A reference on the file 4059 * entry is held upon returning. 4060 */ 4061 int 4062 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4063 { 4064 struct file *fp; 4065 int error; 4066 4067 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); 4068 if (error != 0) 4069 return (error); 4070 4071 /* 4072 * The file could be not of the vnode type, or it may be not 4073 * yet fully initialized, in which case the f_vnode pointer 4074 * may be set, but f_ops is still badfileops. E.g., 4075 * devfs_open() transiently create such situation to 4076 * facilitate csw d_fdopen(). 4077 * 4078 * Dupfdopen() handling in kern_openat() installs the 4079 * half-baked file into the process descriptor table, allowing 4080 * other thread to dereference it. Guard against the race by 4081 * checking f_ops. 4082 */ 4083 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4084 fdrop(fp, td); 4085 return (EINVAL); 4086 } 4087 *fpp = fp; 4088 return (0); 4089 } 4090 4091 4092 /* 4093 * Get an (NFS) file handle. 4094 */ 4095 #ifndef _SYS_SYSPROTO_H_ 4096 struct lgetfh_args { 4097 char *fname; 4098 fhandle_t *fhp; 4099 }; 4100 #endif 4101 int 4102 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4103 { 4104 struct nameidata nd; 4105 fhandle_t fh; 4106 struct vnode *vp; 4107 int error; 4108 4109 error = priv_check(td, PRIV_VFS_GETFH); 4110 if (error != 0) 4111 return (error); 4112 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4113 uap->fname, td); 4114 error = namei(&nd); 4115 if (error != 0) 4116 return (error); 4117 NDFREE(&nd, NDF_ONLY_PNBUF); 4118 vp = nd.ni_vp; 4119 bzero(&fh, sizeof(fh)); 4120 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4121 error = VOP_VPTOFH(vp, &fh.fh_fid); 4122 vput(vp); 4123 if (error == 0) 4124 error = copyout(&fh, uap->fhp, sizeof (fh)); 4125 return (error); 4126 } 4127 4128 #ifndef _SYS_SYSPROTO_H_ 4129 struct getfh_args { 4130 char *fname; 4131 fhandle_t *fhp; 4132 }; 4133 #endif 4134 int 4135 sys_getfh(struct thread *td, struct getfh_args *uap) 4136 { 4137 struct nameidata nd; 4138 fhandle_t fh; 4139 struct vnode *vp; 4140 int error; 4141 4142 error = priv_check(td, PRIV_VFS_GETFH); 4143 if (error != 0) 4144 return (error); 4145 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4146 uap->fname, td); 4147 error = namei(&nd); 4148 if (error != 0) 4149 return (error); 4150 NDFREE(&nd, NDF_ONLY_PNBUF); 4151 vp = nd.ni_vp; 4152 bzero(&fh, sizeof(fh)); 4153 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4154 error = VOP_VPTOFH(vp, &fh.fh_fid); 4155 vput(vp); 4156 if (error == 0) 4157 error = copyout(&fh, uap->fhp, sizeof (fh)); 4158 return (error); 4159 } 4160 4161 /* 4162 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4163 * open descriptor. 4164 * 4165 * warning: do not remove the priv_check() call or this becomes one giant 4166 * security hole. 4167 */ 4168 #ifndef _SYS_SYSPROTO_H_ 4169 struct fhopen_args { 4170 const struct fhandle *u_fhp; 4171 int flags; 4172 }; 4173 #endif 4174 int 4175 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4176 { 4177 struct mount *mp; 4178 struct vnode *vp; 4179 struct fhandle fhp; 4180 struct file *fp; 4181 int fmode, error; 4182 int indx; 4183 4184 error = priv_check(td, PRIV_VFS_FHOPEN); 4185 if (error != 0) 4186 return (error); 4187 indx = -1; 4188 fmode = FFLAGS(uap->flags); 4189 /* why not allow a non-read/write open for our lockd? */ 4190 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4191 return (EINVAL); 4192 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4193 if (error != 0) 4194 return(error); 4195 /* find the mount point */ 4196 mp = vfs_busyfs(&fhp.fh_fsid); 4197 if (mp == NULL) 4198 return (ESTALE); 4199 /* now give me my vnode, it gets returned to me locked */ 4200 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4201 vfs_unbusy(mp); 4202 if (error != 0) 4203 return (error); 4204 4205 error = falloc_noinstall(td, &fp); 4206 if (error != 0) { 4207 vput(vp); 4208 return (error); 4209 } 4210 /* 4211 * An extra reference on `fp' has been held for us by 4212 * falloc_noinstall(). 4213 */ 4214 4215 #ifdef INVARIANTS 4216 td->td_dupfd = -1; 4217 #endif 4218 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4219 if (error != 0) { 4220 KASSERT(fp->f_ops == &badfileops, 4221 ("VOP_OPEN in fhopen() set f_ops")); 4222 KASSERT(td->td_dupfd < 0, 4223 ("fhopen() encountered fdopen()")); 4224 4225 vput(vp); 4226 goto bad; 4227 } 4228 #ifdef INVARIANTS 4229 td->td_dupfd = 0; 4230 #endif 4231 fp->f_vnode = vp; 4232 fp->f_seqcount = 1; 4233 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp, 4234 &vnops); 4235 VOP_UNLOCK(vp, 0); 4236 if ((fmode & O_TRUNC) != 0) { 4237 error = fo_truncate(fp, 0, td->td_ucred, td); 4238 if (error != 0) 4239 goto bad; 4240 } 4241 4242 error = finstall(td, fp, &indx, fmode, NULL); 4243 bad: 4244 fdrop(fp, td); 4245 td->td_retval[0] = indx; 4246 return (error); 4247 } 4248 4249 /* 4250 * Stat an (NFS) file handle. 4251 */ 4252 #ifndef _SYS_SYSPROTO_H_ 4253 struct fhstat_args { 4254 struct fhandle *u_fhp; 4255 struct stat *sb; 4256 }; 4257 #endif 4258 int 4259 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4260 { 4261 struct stat sb; 4262 struct fhandle fh; 4263 int error; 4264 4265 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4266 if (error != 0) 4267 return (error); 4268 error = kern_fhstat(td, fh, &sb); 4269 if (error == 0) 4270 error = copyout(&sb, uap->sb, sizeof(sb)); 4271 return (error); 4272 } 4273 4274 int 4275 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4276 { 4277 struct mount *mp; 4278 struct vnode *vp; 4279 int error; 4280 4281 error = priv_check(td, PRIV_VFS_FHSTAT); 4282 if (error != 0) 4283 return (error); 4284 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4285 return (ESTALE); 4286 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4287 vfs_unbusy(mp); 4288 if (error != 0) 4289 return (error); 4290 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td); 4291 vput(vp); 4292 return (error); 4293 } 4294 4295 /* 4296 * Implement fstatfs() for (NFS) file handles. 4297 */ 4298 #ifndef _SYS_SYSPROTO_H_ 4299 struct fhstatfs_args { 4300 struct fhandle *u_fhp; 4301 struct statfs *buf; 4302 }; 4303 #endif 4304 int 4305 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4306 { 4307 struct statfs *sfp; 4308 fhandle_t fh; 4309 int error; 4310 4311 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4312 if (error != 0) 4313 return (error); 4314 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4315 error = kern_fhstatfs(td, fh, sfp); 4316 if (error == 0) 4317 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4318 free(sfp, M_STATFS); 4319 return (error); 4320 } 4321 4322 int 4323 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4324 { 4325 struct statfs *sp; 4326 struct mount *mp; 4327 struct vnode *vp; 4328 int error; 4329 4330 error = priv_check(td, PRIV_VFS_FHSTATFS); 4331 if (error != 0) 4332 return (error); 4333 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4334 return (ESTALE); 4335 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4336 if (error != 0) { 4337 vfs_unbusy(mp); 4338 return (error); 4339 } 4340 vput(vp); 4341 error = prison_canseemount(td->td_ucred, mp); 4342 if (error != 0) 4343 goto out; 4344 #ifdef MAC 4345 error = mac_mount_check_stat(td->td_ucred, mp); 4346 if (error != 0) 4347 goto out; 4348 #endif 4349 /* 4350 * Set these in case the underlying filesystem fails to do so. 4351 */ 4352 sp = &mp->mnt_stat; 4353 sp->f_version = STATFS_VERSION; 4354 sp->f_namemax = NAME_MAX; 4355 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 4356 error = VFS_STATFS(mp, sp); 4357 if (error == 0) 4358 *buf = *sp; 4359 out: 4360 vfs_unbusy(mp); 4361 return (error); 4362 } 4363 4364 int 4365 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len) 4366 { 4367 struct file *fp; 4368 struct mount *mp; 4369 struct vnode *vp; 4370 off_t olen, ooffset; 4371 int error; 4372 #ifdef AUDIT 4373 int audited_vnode1 = 0; 4374 #endif 4375 4376 AUDIT_ARG_FD(fd); 4377 if (offset < 0 || len <= 0) 4378 return (EINVAL); 4379 /* Check for wrap. */ 4380 if (offset > OFF_MAX - len) 4381 return (EFBIG); 4382 AUDIT_ARG_FD(fd); 4383 error = fget(td, fd, &cap_pwrite_rights, &fp); 4384 if (error != 0) 4385 return (error); 4386 AUDIT_ARG_FILE(td->td_proc, fp); 4387 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4388 error = ESPIPE; 4389 goto out; 4390 } 4391 if ((fp->f_flag & FWRITE) == 0) { 4392 error = EBADF; 4393 goto out; 4394 } 4395 if (fp->f_type != DTYPE_VNODE) { 4396 error = ENODEV; 4397 goto out; 4398 } 4399 vp = fp->f_vnode; 4400 if (vp->v_type != VREG) { 4401 error = ENODEV; 4402 goto out; 4403 } 4404 4405 /* Allocating blocks may take a long time, so iterate. */ 4406 for (;;) { 4407 olen = len; 4408 ooffset = offset; 4409 4410 bwillwrite(); 4411 mp = NULL; 4412 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 4413 if (error != 0) 4414 break; 4415 error = vn_lock(vp, LK_EXCLUSIVE); 4416 if (error != 0) { 4417 vn_finished_write(mp); 4418 break; 4419 } 4420 #ifdef AUDIT 4421 if (!audited_vnode1) { 4422 AUDIT_ARG_VNODE1(vp); 4423 audited_vnode1 = 1; 4424 } 4425 #endif 4426 #ifdef MAC 4427 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp); 4428 if (error == 0) 4429 #endif 4430 error = VOP_ALLOCATE(vp, &offset, &len); 4431 VOP_UNLOCK(vp, 0); 4432 vn_finished_write(mp); 4433 4434 if (olen + ooffset != offset + len) { 4435 panic("offset + len changed from %jx/%jx to %jx/%jx", 4436 ooffset, olen, offset, len); 4437 } 4438 if (error != 0 || len == 0) 4439 break; 4440 KASSERT(olen > len, ("Iteration did not make progress?")); 4441 maybe_yield(); 4442 } 4443 out: 4444 fdrop(fp, td); 4445 return (error); 4446 } 4447 4448 int 4449 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap) 4450 { 4451 int error; 4452 4453 error = kern_posix_fallocate(td, uap->fd, uap->offset, uap->len); 4454 return (kern_posix_error(td, error)); 4455 } 4456 4457 /* 4458 * Unlike madvise(2), we do not make a best effort to remember every 4459 * possible caching hint. Instead, we remember the last setting with 4460 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4461 * region of any current setting. 4462 */ 4463 int 4464 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4465 int advice) 4466 { 4467 struct fadvise_info *fa, *new; 4468 struct file *fp; 4469 struct vnode *vp; 4470 off_t end; 4471 int error; 4472 4473 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4474 return (EINVAL); 4475 AUDIT_ARG_VALUE(advice); 4476 switch (advice) { 4477 case POSIX_FADV_SEQUENTIAL: 4478 case POSIX_FADV_RANDOM: 4479 case POSIX_FADV_NOREUSE: 4480 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4481 break; 4482 case POSIX_FADV_NORMAL: 4483 case POSIX_FADV_WILLNEED: 4484 case POSIX_FADV_DONTNEED: 4485 new = NULL; 4486 break; 4487 default: 4488 return (EINVAL); 4489 } 4490 /* XXX: CAP_POSIX_FADVISE? */ 4491 AUDIT_ARG_FD(fd); 4492 error = fget(td, fd, &cap_no_rights, &fp); 4493 if (error != 0) 4494 goto out; 4495 AUDIT_ARG_FILE(td->td_proc, fp); 4496 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4497 error = ESPIPE; 4498 goto out; 4499 } 4500 if (fp->f_type != DTYPE_VNODE) { 4501 error = ENODEV; 4502 goto out; 4503 } 4504 vp = fp->f_vnode; 4505 if (vp->v_type != VREG) { 4506 error = ENODEV; 4507 goto out; 4508 } 4509 if (len == 0) 4510 end = OFF_MAX; 4511 else 4512 end = offset + len - 1; 4513 switch (advice) { 4514 case POSIX_FADV_SEQUENTIAL: 4515 case POSIX_FADV_RANDOM: 4516 case POSIX_FADV_NOREUSE: 4517 /* 4518 * Try to merge any existing non-standard region with 4519 * this new region if possible, otherwise create a new 4520 * non-standard region for this request. 4521 */ 4522 mtx_pool_lock(mtxpool_sleep, fp); 4523 fa = fp->f_advice; 4524 if (fa != NULL && fa->fa_advice == advice && 4525 ((fa->fa_start <= end && fa->fa_end >= offset) || 4526 (end != OFF_MAX && fa->fa_start == end + 1) || 4527 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4528 if (offset < fa->fa_start) 4529 fa->fa_start = offset; 4530 if (end > fa->fa_end) 4531 fa->fa_end = end; 4532 } else { 4533 new->fa_advice = advice; 4534 new->fa_start = offset; 4535 new->fa_end = end; 4536 fp->f_advice = new; 4537 new = fa; 4538 } 4539 mtx_pool_unlock(mtxpool_sleep, fp); 4540 break; 4541 case POSIX_FADV_NORMAL: 4542 /* 4543 * If a the "normal" region overlaps with an existing 4544 * non-standard region, trim or remove the 4545 * non-standard region. 4546 */ 4547 mtx_pool_lock(mtxpool_sleep, fp); 4548 fa = fp->f_advice; 4549 if (fa != NULL) { 4550 if (offset <= fa->fa_start && end >= fa->fa_end) { 4551 new = fa; 4552 fp->f_advice = NULL; 4553 } else if (offset <= fa->fa_start && 4554 end >= fa->fa_start) 4555 fa->fa_start = end + 1; 4556 else if (offset <= fa->fa_end && end >= fa->fa_end) 4557 fa->fa_end = offset - 1; 4558 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4559 /* 4560 * If the "normal" region is a middle 4561 * portion of the existing 4562 * non-standard region, just remove 4563 * the whole thing rather than picking 4564 * one side or the other to 4565 * preserve. 4566 */ 4567 new = fa; 4568 fp->f_advice = NULL; 4569 } 4570 } 4571 mtx_pool_unlock(mtxpool_sleep, fp); 4572 break; 4573 case POSIX_FADV_WILLNEED: 4574 case POSIX_FADV_DONTNEED: 4575 error = VOP_ADVISE(vp, offset, end, advice); 4576 break; 4577 } 4578 out: 4579 if (fp != NULL) 4580 fdrop(fp, td); 4581 free(new, M_FADVISE); 4582 return (error); 4583 } 4584 4585 int 4586 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4587 { 4588 int error; 4589 4590 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4591 uap->advice); 4592 return (kern_posix_error(td, error)); 4593 } 4594