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_compat.h" 44 #include "opt_ktrace.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/bio.h> 49 #include <sys/buf.h> 50 #include <sys/capsicum.h> 51 #include <sys/disk.h> 52 #include <sys/sysent.h> 53 #include <sys/malloc.h> 54 #include <sys/mount.h> 55 #include <sys/mutex.h> 56 #include <sys/sysproto.h> 57 #include <sys/namei.h> 58 #include <sys/filedesc.h> 59 #include <sys/kernel.h> 60 #include <sys/fcntl.h> 61 #include <sys/file.h> 62 #include <sys/filio.h> 63 #include <sys/limits.h> 64 #include <sys/linker.h> 65 #include <sys/rwlock.h> 66 #include <sys/sdt.h> 67 #include <sys/stat.h> 68 #include <sys/sx.h> 69 #include <sys/unistd.h> 70 #include <sys/vnode.h> 71 #include <sys/priv.h> 72 #include <sys/proc.h> 73 #include <sys/dirent.h> 74 #include <sys/jail.h> 75 #include <sys/syscallsubr.h> 76 #include <sys/sysctl.h> 77 #ifdef KTRACE 78 #include <sys/ktrace.h> 79 #endif 80 81 #include <machine/stdarg.h> 82 83 #include <security/audit/audit.h> 84 #include <security/mac/mac_framework.h> 85 86 #include <vm/vm.h> 87 #include <vm/vm_object.h> 88 #include <vm/vm_page.h> 89 #include <vm/uma.h> 90 91 #include <ufs/ufs/quota.h> 92 93 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 94 95 SDT_PROVIDER_DEFINE(vfs); 96 SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int"); 97 SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int"); 98 99 static int kern_chflagsat(struct thread *td, int fd, const char *path, 100 enum uio_seg pathseg, u_long flags, int atflag); 101 static int setfflags(struct thread *td, struct vnode *, u_long); 102 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 103 static int getutimens(const struct timespec *, enum uio_seg, 104 struct timespec *, int *); 105 static int setutimes(struct thread *td, struct vnode *, 106 const struct timespec *, int, int); 107 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 108 struct thread *td); 109 110 /* 111 * Sync each mounted filesystem. 112 */ 113 #ifndef _SYS_SYSPROTO_H_ 114 struct sync_args { 115 int dummy; 116 }; 117 #endif 118 /* ARGSUSED */ 119 int 120 sys_sync(struct thread *td, struct sync_args *uap) 121 { 122 struct mount *mp, *nmp; 123 int save; 124 125 mtx_lock(&mountlist_mtx); 126 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 127 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 128 nmp = TAILQ_NEXT(mp, mnt_list); 129 continue; 130 } 131 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 132 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 133 save = curthread_pflags_set(TDP_SYNCIO); 134 vfs_msync(mp, MNT_NOWAIT); 135 VFS_SYNC(mp, MNT_NOWAIT); 136 curthread_pflags_restore(save); 137 vn_finished_write(mp); 138 } 139 mtx_lock(&mountlist_mtx); 140 nmp = TAILQ_NEXT(mp, mnt_list); 141 vfs_unbusy(mp); 142 } 143 mtx_unlock(&mountlist_mtx); 144 return (0); 145 } 146 147 /* 148 * Change filesystem quotas. 149 */ 150 #ifndef _SYS_SYSPROTO_H_ 151 struct quotactl_args { 152 char *path; 153 int cmd; 154 int uid; 155 caddr_t arg; 156 }; 157 #endif 158 int 159 sys_quotactl(struct thread *td, struct quotactl_args *uap) 160 { 161 struct mount *mp; 162 struct nameidata nd; 163 int error; 164 165 AUDIT_ARG_CMD(uap->cmd); 166 AUDIT_ARG_UID(uap->uid); 167 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 168 return (EPERM); 169 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 170 uap->path, td); 171 if ((error = namei(&nd)) != 0) 172 return (error); 173 NDFREE(&nd, NDF_ONLY_PNBUF); 174 mp = nd.ni_vp->v_mount; 175 vfs_ref(mp); 176 vput(nd.ni_vp); 177 error = vfs_busy(mp, 0); 178 vfs_rel(mp); 179 if (error != 0) 180 return (error); 181 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); 182 183 /* 184 * Since quota on operation typically needs to open quota 185 * file, the Q_QUOTAON handler needs to unbusy the mount point 186 * before calling into namei. Otherwise, unmount might be 187 * started between two vfs_busy() invocations (first is our, 188 * second is from mount point cross-walk code in lookup()), 189 * causing deadlock. 190 * 191 * Require that Q_QUOTAON handles the vfs_busy() reference on 192 * its own, always returning with ubusied mount point. 193 */ 194 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON) 195 vfs_unbusy(mp); 196 return (error); 197 } 198 199 /* 200 * Used by statfs conversion routines to scale the block size up if 201 * necessary so that all of the block counts are <= 'max_size'. Note 202 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 203 * value of 'n'. 204 */ 205 void 206 statfs_scale_blocks(struct statfs *sf, long max_size) 207 { 208 uint64_t count; 209 int shift; 210 211 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 212 213 /* 214 * Attempt to scale the block counts to give a more accurate 215 * overview to userland of the ratio of free space to used 216 * space. To do this, find the largest block count and compute 217 * a divisor that lets it fit into a signed integer <= max_size. 218 */ 219 if (sf->f_bavail < 0) 220 count = -sf->f_bavail; 221 else 222 count = sf->f_bavail; 223 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 224 if (count <= max_size) 225 return; 226 227 count >>= flsl(max_size); 228 shift = 0; 229 while (count > 0) { 230 shift++; 231 count >>=1; 232 } 233 234 sf->f_bsize <<= shift; 235 sf->f_blocks >>= shift; 236 sf->f_bfree >>= shift; 237 sf->f_bavail >>= shift; 238 } 239 240 static int 241 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 242 { 243 struct statfs *sp; 244 int error; 245 246 if (mp == NULL) 247 return (EBADF); 248 error = vfs_busy(mp, 0); 249 vfs_rel(mp); 250 if (error != 0) 251 return (error); 252 #ifdef MAC 253 error = mac_mount_check_stat(td->td_ucred, mp); 254 if (error != 0) 255 goto out; 256 #endif 257 /* 258 * Set these in case the underlying filesystem fails to do so. 259 */ 260 sp = &mp->mnt_stat; 261 sp->f_version = STATFS_VERSION; 262 sp->f_namemax = NAME_MAX; 263 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 264 error = VFS_STATFS(mp, sp); 265 if (error != 0) 266 goto out; 267 *buf = *sp; 268 if (priv_check(td, PRIV_VFS_GENERATION)) { 269 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 270 prison_enforce_statfs(td->td_ucred, mp, buf); 271 } 272 out: 273 vfs_unbusy(mp); 274 return (error); 275 } 276 277 /* 278 * Get filesystem statistics. 279 */ 280 #ifndef _SYS_SYSPROTO_H_ 281 struct statfs_args { 282 char *path; 283 struct statfs *buf; 284 }; 285 #endif 286 int 287 sys_statfs(struct thread *td, struct statfs_args *uap) 288 { 289 struct statfs *sfp; 290 int error; 291 292 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 293 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 294 if (error == 0) 295 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 296 free(sfp, M_STATFS); 297 return (error); 298 } 299 300 int 301 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg, 302 struct statfs *buf) 303 { 304 struct mount *mp; 305 struct nameidata nd; 306 int error; 307 308 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 309 pathseg, path, td); 310 error = namei(&nd); 311 if (error != 0) 312 return (error); 313 mp = nd.ni_vp->v_mount; 314 vfs_ref(mp); 315 NDFREE(&nd, NDF_ONLY_PNBUF); 316 vput(nd.ni_vp); 317 return (kern_do_statfs(td, mp, buf)); 318 } 319 320 /* 321 * Get filesystem statistics. 322 */ 323 #ifndef _SYS_SYSPROTO_H_ 324 struct fstatfs_args { 325 int fd; 326 struct statfs *buf; 327 }; 328 #endif 329 int 330 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 331 { 332 struct statfs *sfp; 333 int error; 334 335 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 336 error = kern_fstatfs(td, uap->fd, sfp); 337 if (error == 0) 338 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 339 free(sfp, M_STATFS); 340 return (error); 341 } 342 343 int 344 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 345 { 346 struct file *fp; 347 struct mount *mp; 348 struct vnode *vp; 349 cap_rights_t rights; 350 int error; 351 352 AUDIT_ARG_FD(fd); 353 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FSTATFS), &fp); 354 if (error != 0) 355 return (error); 356 vp = fp->f_vnode; 357 vn_lock(vp, LK_SHARED | LK_RETRY); 358 #ifdef AUDIT 359 AUDIT_ARG_VNODE1(vp); 360 #endif 361 mp = vp->v_mount; 362 if (mp != NULL) 363 vfs_ref(mp); 364 VOP_UNLOCK(vp, 0); 365 fdrop(fp, td); 366 return (kern_do_statfs(td, mp, buf)); 367 } 368 369 /* 370 * Get statistics on all filesystems. 371 */ 372 #ifndef _SYS_SYSPROTO_H_ 373 struct getfsstat_args { 374 struct statfs *buf; 375 long bufsize; 376 int mode; 377 }; 378 #endif 379 int 380 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 381 { 382 size_t count; 383 int error; 384 385 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 386 return (EINVAL); 387 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 388 UIO_USERSPACE, uap->mode); 389 if (error == 0) 390 td->td_retval[0] = count; 391 return (error); 392 } 393 394 /* 395 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 396 * The caller is responsible for freeing memory which will be allocated 397 * in '*buf'. 398 */ 399 int 400 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 401 size_t *countp, enum uio_seg bufseg, int mode) 402 { 403 struct mount *mp, *nmp; 404 struct statfs *sfsp, *sp, *sptmp, *tofree; 405 size_t count, maxcount; 406 int error; 407 408 switch (mode) { 409 case MNT_WAIT: 410 case MNT_NOWAIT: 411 break; 412 default: 413 if (bufseg == UIO_SYSSPACE) 414 *buf = NULL; 415 return (EINVAL); 416 } 417 restart: 418 maxcount = bufsize / sizeof(struct statfs); 419 if (bufsize == 0) { 420 sfsp = NULL; 421 tofree = NULL; 422 } else if (bufseg == UIO_USERSPACE) { 423 sfsp = *buf; 424 tofree = NULL; 425 } else /* if (bufseg == UIO_SYSSPACE) */ { 426 count = 0; 427 mtx_lock(&mountlist_mtx); 428 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 429 count++; 430 } 431 mtx_unlock(&mountlist_mtx); 432 if (maxcount > count) 433 maxcount = count; 434 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 435 M_STATFS, M_WAITOK); 436 } 437 count = 0; 438 mtx_lock(&mountlist_mtx); 439 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 440 if (prison_canseemount(td->td_ucred, mp) != 0) { 441 nmp = TAILQ_NEXT(mp, mnt_list); 442 continue; 443 } 444 #ifdef MAC 445 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 446 nmp = TAILQ_NEXT(mp, mnt_list); 447 continue; 448 } 449 #endif 450 if (mode == MNT_WAIT) { 451 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 452 /* 453 * If vfs_busy() failed, and MBF_NOWAIT 454 * wasn't passed, then the mp is gone. 455 * Furthermore, because of MBF_MNTLSTLOCK, 456 * the mountlist_mtx was dropped. We have 457 * no other choice than to start over. 458 */ 459 mtx_unlock(&mountlist_mtx); 460 free(tofree, M_STATFS); 461 goto restart; 462 } 463 } else { 464 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 465 nmp = TAILQ_NEXT(mp, mnt_list); 466 continue; 467 } 468 } 469 if (sfsp != NULL && count < maxcount) { 470 sp = &mp->mnt_stat; 471 /* 472 * Set these in case the underlying filesystem 473 * fails to do so. 474 */ 475 sp->f_version = STATFS_VERSION; 476 sp->f_namemax = NAME_MAX; 477 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 478 /* 479 * If MNT_NOWAIT is specified, do not refresh 480 * the fsstat cache. 481 */ 482 if (mode != MNT_NOWAIT) { 483 error = VFS_STATFS(mp, sp); 484 if (error != 0) { 485 mtx_lock(&mountlist_mtx); 486 nmp = TAILQ_NEXT(mp, mnt_list); 487 vfs_unbusy(mp); 488 continue; 489 } 490 } 491 if (priv_check(td, PRIV_VFS_GENERATION)) { 492 sptmp = malloc(sizeof(struct statfs), M_STATFS, 493 M_WAITOK); 494 *sptmp = *sp; 495 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 496 prison_enforce_statfs(td->td_ucred, mp, sptmp); 497 sp = sptmp; 498 } else 499 sptmp = NULL; 500 if (bufseg == UIO_SYSSPACE) { 501 bcopy(sp, sfsp, sizeof(*sp)); 502 free(sptmp, M_STATFS); 503 } else /* if (bufseg == UIO_USERSPACE) */ { 504 error = copyout(sp, sfsp, sizeof(*sp)); 505 free(sptmp, M_STATFS); 506 if (error != 0) { 507 vfs_unbusy(mp); 508 return (error); 509 } 510 } 511 sfsp++; 512 } 513 count++; 514 mtx_lock(&mountlist_mtx); 515 nmp = TAILQ_NEXT(mp, mnt_list); 516 vfs_unbusy(mp); 517 } 518 mtx_unlock(&mountlist_mtx); 519 if (sfsp != NULL && count > maxcount) 520 *countp = maxcount; 521 else 522 *countp = count; 523 return (0); 524 } 525 526 #ifdef COMPAT_FREEBSD4 527 /* 528 * Get old format filesystem statistics. 529 */ 530 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 531 532 #ifndef _SYS_SYSPROTO_H_ 533 struct freebsd4_statfs_args { 534 char *path; 535 struct ostatfs *buf; 536 }; 537 #endif 538 int 539 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 540 { 541 struct ostatfs osb; 542 struct statfs *sfp; 543 int error; 544 545 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 546 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 547 if (error == 0) { 548 freebsd4_cvtstatfs(sfp, &osb); 549 error = copyout(&osb, uap->buf, sizeof(osb)); 550 } 551 free(sfp, M_STATFS); 552 return (error); 553 } 554 555 /* 556 * Get filesystem statistics. 557 */ 558 #ifndef _SYS_SYSPROTO_H_ 559 struct freebsd4_fstatfs_args { 560 int fd; 561 struct ostatfs *buf; 562 }; 563 #endif 564 int 565 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 566 { 567 struct ostatfs osb; 568 struct statfs *sfp; 569 int error; 570 571 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 572 error = kern_fstatfs(td, uap->fd, sfp); 573 if (error == 0) { 574 freebsd4_cvtstatfs(sfp, &osb); 575 error = copyout(&osb, uap->buf, sizeof(osb)); 576 } 577 free(sfp, M_STATFS); 578 return (error); 579 } 580 581 /* 582 * Get statistics on all filesystems. 583 */ 584 #ifndef _SYS_SYSPROTO_H_ 585 struct freebsd4_getfsstat_args { 586 struct ostatfs *buf; 587 long bufsize; 588 int mode; 589 }; 590 #endif 591 int 592 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 593 { 594 struct statfs *buf, *sp; 595 struct ostatfs osb; 596 size_t count, size; 597 int error; 598 599 if (uap->bufsize < 0) 600 return (EINVAL); 601 count = uap->bufsize / sizeof(struct ostatfs); 602 if (count > SIZE_MAX / sizeof(struct statfs)) 603 return (EINVAL); 604 size = count * sizeof(struct statfs); 605 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 606 uap->mode); 607 if (error == 0) 608 td->td_retval[0] = count; 609 if (size != 0) { 610 sp = buf; 611 while (count != 0 && error == 0) { 612 freebsd4_cvtstatfs(sp, &osb); 613 error = copyout(&osb, uap->buf, sizeof(osb)); 614 sp++; 615 uap->buf++; 616 count--; 617 } 618 free(buf, M_STATFS); 619 } 620 return (error); 621 } 622 623 /* 624 * Implement fstatfs() for (NFS) file handles. 625 */ 626 #ifndef _SYS_SYSPROTO_H_ 627 struct freebsd4_fhstatfs_args { 628 struct fhandle *u_fhp; 629 struct ostatfs *buf; 630 }; 631 #endif 632 int 633 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 634 { 635 struct ostatfs osb; 636 struct statfs *sfp; 637 fhandle_t fh; 638 int error; 639 640 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 641 if (error != 0) 642 return (error); 643 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 644 error = kern_fhstatfs(td, fh, sfp); 645 if (error == 0) { 646 freebsd4_cvtstatfs(sfp, &osb); 647 error = copyout(&osb, uap->buf, sizeof(osb)); 648 } 649 free(sfp, M_STATFS); 650 return (error); 651 } 652 653 /* 654 * Convert a new format statfs structure to an old format statfs structure. 655 */ 656 static void 657 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 658 { 659 660 statfs_scale_blocks(nsp, LONG_MAX); 661 bzero(osp, sizeof(*osp)); 662 osp->f_bsize = nsp->f_bsize; 663 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 664 osp->f_blocks = nsp->f_blocks; 665 osp->f_bfree = nsp->f_bfree; 666 osp->f_bavail = nsp->f_bavail; 667 osp->f_files = MIN(nsp->f_files, LONG_MAX); 668 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 669 osp->f_owner = nsp->f_owner; 670 osp->f_type = nsp->f_type; 671 osp->f_flags = nsp->f_flags; 672 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 673 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 674 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 675 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 676 strlcpy(osp->f_fstypename, nsp->f_fstypename, 677 MIN(MFSNAMELEN, OMFSNAMELEN)); 678 strlcpy(osp->f_mntonname, nsp->f_mntonname, 679 MIN(MNAMELEN, OMNAMELEN)); 680 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 681 MIN(MNAMELEN, OMNAMELEN)); 682 osp->f_fsid = nsp->f_fsid; 683 } 684 #endif /* COMPAT_FREEBSD4 */ 685 686 #if defined(COMPAT_FREEBSD11) 687 /* 688 * Get old format filesystem statistics. 689 */ 690 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 691 692 int 693 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 694 { 695 struct freebsd11_statfs osb; 696 struct statfs *sfp; 697 int error; 698 699 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 700 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 701 if (error == 0) { 702 freebsd11_cvtstatfs(sfp, &osb); 703 error = copyout(&osb, uap->buf, sizeof(osb)); 704 } 705 free(sfp, M_STATFS); 706 return (error); 707 } 708 709 /* 710 * Get filesystem statistics. 711 */ 712 int 713 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 714 { 715 struct freebsd11_statfs osb; 716 struct statfs *sfp; 717 int error; 718 719 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 720 error = kern_fstatfs(td, uap->fd, sfp); 721 if (error == 0) { 722 freebsd11_cvtstatfs(sfp, &osb); 723 error = copyout(&osb, uap->buf, sizeof(osb)); 724 } 725 free(sfp, M_STATFS); 726 return (error); 727 } 728 729 /* 730 * Get statistics on all filesystems. 731 */ 732 int 733 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 734 { 735 struct freebsd11_statfs osb; 736 struct statfs *buf, *sp; 737 size_t count, size; 738 int error; 739 740 count = uap->bufsize / sizeof(struct ostatfs); 741 size = count * sizeof(struct statfs); 742 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 743 uap->mode); 744 if (error == 0) 745 td->td_retval[0] = count; 746 if (size > 0) { 747 sp = buf; 748 while (count > 0 && error == 0) { 749 freebsd11_cvtstatfs(sp, &osb); 750 error = copyout(&osb, uap->buf, sizeof(osb)); 751 sp++; 752 uap->buf++; 753 count--; 754 } 755 free(buf, M_STATFS); 756 } 757 return (error); 758 } 759 760 /* 761 * Implement fstatfs() for (NFS) file handles. 762 */ 763 int 764 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 765 { 766 struct freebsd11_statfs osb; 767 struct statfs *sfp; 768 fhandle_t fh; 769 int error; 770 771 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 772 if (error) 773 return (error); 774 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 775 error = kern_fhstatfs(td, fh, sfp); 776 if (error == 0) { 777 freebsd11_cvtstatfs(sfp, &osb); 778 error = copyout(&osb, uap->buf, sizeof(osb)); 779 } 780 free(sfp, M_STATFS); 781 return (error); 782 } 783 784 /* 785 * Convert a new format statfs structure to an old format statfs structure. 786 */ 787 static void 788 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 789 { 790 791 bzero(osp, sizeof(*osp)); 792 osp->f_version = FREEBSD11_STATFS_VERSION; 793 osp->f_type = nsp->f_type; 794 osp->f_flags = nsp->f_flags; 795 osp->f_bsize = nsp->f_bsize; 796 osp->f_iosize = nsp->f_iosize; 797 osp->f_blocks = nsp->f_blocks; 798 osp->f_bfree = nsp->f_bfree; 799 osp->f_bavail = nsp->f_bavail; 800 osp->f_files = nsp->f_files; 801 osp->f_ffree = nsp->f_ffree; 802 osp->f_syncwrites = nsp->f_syncwrites; 803 osp->f_asyncwrites = nsp->f_asyncwrites; 804 osp->f_syncreads = nsp->f_syncreads; 805 osp->f_asyncreads = nsp->f_asyncreads; 806 osp->f_namemax = nsp->f_namemax; 807 osp->f_owner = nsp->f_owner; 808 osp->f_fsid = nsp->f_fsid; 809 strlcpy(osp->f_fstypename, nsp->f_fstypename, 810 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 811 strlcpy(osp->f_mntonname, nsp->f_mntonname, 812 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 813 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 814 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 815 } 816 #endif /* COMPAT_FREEBSD11 */ 817 818 /* 819 * Change current working directory to a given file descriptor. 820 */ 821 #ifndef _SYS_SYSPROTO_H_ 822 struct fchdir_args { 823 int fd; 824 }; 825 #endif 826 int 827 sys_fchdir(struct thread *td, struct fchdir_args *uap) 828 { 829 struct vnode *vp, *tdp; 830 struct mount *mp; 831 struct file *fp; 832 cap_rights_t rights; 833 int error; 834 835 AUDIT_ARG_FD(uap->fd); 836 error = getvnode(td, uap->fd, cap_rights_init(&rights, CAP_FCHDIR), 837 &fp); 838 if (error != 0) 839 return (error); 840 vp = fp->f_vnode; 841 vrefact(vp); 842 fdrop(fp, td); 843 vn_lock(vp, LK_SHARED | LK_RETRY); 844 AUDIT_ARG_VNODE1(vp); 845 error = change_dir(vp, td); 846 while (!error && (mp = vp->v_mountedhere) != NULL) { 847 if (vfs_busy(mp, 0)) 848 continue; 849 error = VFS_ROOT(mp, LK_SHARED, &tdp); 850 vfs_unbusy(mp); 851 if (error != 0) 852 break; 853 vput(vp); 854 vp = tdp; 855 } 856 if (error != 0) { 857 vput(vp); 858 return (error); 859 } 860 VOP_UNLOCK(vp, 0); 861 pwd_chdir(td, vp); 862 return (0); 863 } 864 865 /* 866 * Change current working directory (``.''). 867 */ 868 #ifndef _SYS_SYSPROTO_H_ 869 struct chdir_args { 870 char *path; 871 }; 872 #endif 873 int 874 sys_chdir(struct thread *td, struct chdir_args *uap) 875 { 876 877 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 878 } 879 880 int 881 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg) 882 { 883 struct nameidata nd; 884 int error; 885 886 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 887 pathseg, path, td); 888 if ((error = namei(&nd)) != 0) 889 return (error); 890 if ((error = change_dir(nd.ni_vp, td)) != 0) { 891 vput(nd.ni_vp); 892 NDFREE(&nd, NDF_ONLY_PNBUF); 893 return (error); 894 } 895 VOP_UNLOCK(nd.ni_vp, 0); 896 NDFREE(&nd, NDF_ONLY_PNBUF); 897 pwd_chdir(td, nd.ni_vp); 898 return (0); 899 } 900 901 /* 902 * Change notion of root (``/'') directory. 903 */ 904 #ifndef _SYS_SYSPROTO_H_ 905 struct chroot_args { 906 char *path; 907 }; 908 #endif 909 int 910 sys_chroot(struct thread *td, struct chroot_args *uap) 911 { 912 struct nameidata nd; 913 int error; 914 915 error = priv_check(td, PRIV_VFS_CHROOT); 916 if (error != 0) 917 return (error); 918 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 919 UIO_USERSPACE, uap->path, td); 920 error = namei(&nd); 921 if (error != 0) 922 goto error; 923 error = change_dir(nd.ni_vp, td); 924 if (error != 0) 925 goto e_vunlock; 926 #ifdef MAC 927 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 928 if (error != 0) 929 goto e_vunlock; 930 #endif 931 VOP_UNLOCK(nd.ni_vp, 0); 932 error = pwd_chroot(td, nd.ni_vp); 933 vrele(nd.ni_vp); 934 NDFREE(&nd, NDF_ONLY_PNBUF); 935 return (error); 936 e_vunlock: 937 vput(nd.ni_vp); 938 error: 939 NDFREE(&nd, NDF_ONLY_PNBUF); 940 return (error); 941 } 942 943 /* 944 * Common routine for chroot and chdir. Callers must provide a locked vnode 945 * instance. 946 */ 947 int 948 change_dir(struct vnode *vp, struct thread *td) 949 { 950 #ifdef MAC 951 int error; 952 #endif 953 954 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 955 if (vp->v_type != VDIR) 956 return (ENOTDIR); 957 #ifdef MAC 958 error = mac_vnode_check_chdir(td->td_ucred, vp); 959 if (error != 0) 960 return (error); 961 #endif 962 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 963 } 964 965 static __inline void 966 flags_to_rights(int flags, cap_rights_t *rightsp) 967 { 968 969 if (flags & O_EXEC) { 970 cap_rights_set(rightsp, CAP_FEXECVE); 971 } else { 972 switch ((flags & O_ACCMODE)) { 973 case O_RDONLY: 974 cap_rights_set(rightsp, CAP_READ); 975 break; 976 case O_RDWR: 977 cap_rights_set(rightsp, CAP_READ); 978 /* FALLTHROUGH */ 979 case O_WRONLY: 980 cap_rights_set(rightsp, CAP_WRITE); 981 if (!(flags & (O_APPEND | O_TRUNC))) 982 cap_rights_set(rightsp, CAP_SEEK); 983 break; 984 } 985 } 986 987 if (flags & O_CREAT) 988 cap_rights_set(rightsp, CAP_CREATE); 989 990 if (flags & O_TRUNC) 991 cap_rights_set(rightsp, CAP_FTRUNCATE); 992 993 if (flags & (O_SYNC | O_FSYNC)) 994 cap_rights_set(rightsp, CAP_FSYNC); 995 996 if (flags & (O_EXLOCK | O_SHLOCK)) 997 cap_rights_set(rightsp, CAP_FLOCK); 998 } 999 1000 /* 1001 * Check permissions, allocate an open file structure, and call the device 1002 * open routine if any. 1003 */ 1004 #ifndef _SYS_SYSPROTO_H_ 1005 struct open_args { 1006 char *path; 1007 int flags; 1008 int mode; 1009 }; 1010 #endif 1011 int 1012 sys_open(struct thread *td, struct open_args *uap) 1013 { 1014 1015 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1016 uap->flags, uap->mode)); 1017 } 1018 1019 #ifndef _SYS_SYSPROTO_H_ 1020 struct openat_args { 1021 int fd; 1022 char *path; 1023 int flag; 1024 int mode; 1025 }; 1026 #endif 1027 int 1028 sys_openat(struct thread *td, struct openat_args *uap) 1029 { 1030 1031 AUDIT_ARG_FD(uap->fd); 1032 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1033 uap->mode)); 1034 } 1035 1036 int 1037 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1038 int flags, int mode) 1039 { 1040 struct proc *p = td->td_proc; 1041 struct filedesc *fdp = p->p_fd; 1042 struct file *fp; 1043 struct vnode *vp; 1044 struct nameidata nd; 1045 cap_rights_t rights; 1046 int cmode, error, indx; 1047 1048 indx = -1; 1049 1050 AUDIT_ARG_FFLAGS(flags); 1051 AUDIT_ARG_MODE(mode); 1052 cap_rights_init(&rights, CAP_LOOKUP); 1053 flags_to_rights(flags, &rights); 1054 /* 1055 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1056 * may be specified. 1057 */ 1058 if (flags & O_EXEC) { 1059 if (flags & O_ACCMODE) 1060 return (EINVAL); 1061 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1062 return (EINVAL); 1063 } else { 1064 flags = FFLAGS(flags); 1065 } 1066 1067 /* 1068 * Allocate a file structure. The descriptor to reference it 1069 * is allocated and set by finstall() below. 1070 */ 1071 error = falloc_noinstall(td, &fp); 1072 if (error != 0) 1073 return (error); 1074 /* 1075 * An extra reference on `fp' has been held for us by 1076 * falloc_noinstall(). 1077 */ 1078 /* Set the flags early so the finit in devfs can pick them up. */ 1079 fp->f_flag = flags & FMASK; 1080 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; 1081 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1082 &rights, td); 1083 td->td_dupfd = -1; /* XXX check for fdopen */ 1084 error = vn_open(&nd, &flags, cmode, fp); 1085 if (error != 0) { 1086 /* 1087 * If the vn_open replaced the method vector, something 1088 * wonderous happened deep below and we just pass it up 1089 * pretending we know what we do. 1090 */ 1091 if (error == ENXIO && fp->f_ops != &badfileops) 1092 goto success; 1093 1094 /* 1095 * Handle special fdopen() case. bleh. 1096 * 1097 * Don't do this for relative (capability) lookups; we don't 1098 * understand exactly what would happen, and we don't think 1099 * that it ever should. 1100 */ 1101 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 && 1102 (error == ENODEV || error == ENXIO) && 1103 td->td_dupfd >= 0) { 1104 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1105 &indx); 1106 if (error == 0) 1107 goto success; 1108 } 1109 1110 goto bad; 1111 } 1112 td->td_dupfd = 0; 1113 NDFREE(&nd, NDF_ONLY_PNBUF); 1114 vp = nd.ni_vp; 1115 1116 /* 1117 * Store the vnode, for any f_type. Typically, the vnode use 1118 * count is decremented by direct call to vn_closefile() for 1119 * files that switched type in the cdevsw fdopen() method. 1120 */ 1121 fp->f_vnode = vp; 1122 /* 1123 * If the file wasn't claimed by devfs bind it to the normal 1124 * vnode operations here. 1125 */ 1126 if (fp->f_ops == &badfileops) { 1127 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); 1128 fp->f_seqcount = 1; 1129 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK), 1130 DTYPE_VNODE, vp, &vnops); 1131 } 1132 1133 VOP_UNLOCK(vp, 0); 1134 if (flags & O_TRUNC) { 1135 error = fo_truncate(fp, 0, td->td_ucred, td); 1136 if (error != 0) 1137 goto bad; 1138 } 1139 success: 1140 /* 1141 * If we haven't already installed the FD (for dupfdopen), do so now. 1142 */ 1143 if (indx == -1) { 1144 struct filecaps *fcaps; 1145 1146 #ifdef CAPABILITIES 1147 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0) 1148 fcaps = &nd.ni_filecaps; 1149 else 1150 #endif 1151 fcaps = NULL; 1152 error = finstall(td, fp, &indx, flags, fcaps); 1153 /* On success finstall() consumes fcaps. */ 1154 if (error != 0) { 1155 filecaps_free(&nd.ni_filecaps); 1156 goto bad; 1157 } 1158 } else { 1159 filecaps_free(&nd.ni_filecaps); 1160 } 1161 1162 /* 1163 * Release our private reference, leaving the one associated with 1164 * the descriptor table intact. 1165 */ 1166 fdrop(fp, td); 1167 td->td_retval[0] = indx; 1168 return (0); 1169 bad: 1170 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1171 fdrop(fp, td); 1172 return (error); 1173 } 1174 1175 #ifdef COMPAT_43 1176 /* 1177 * Create a file. 1178 */ 1179 #ifndef _SYS_SYSPROTO_H_ 1180 struct ocreat_args { 1181 char *path; 1182 int mode; 1183 }; 1184 #endif 1185 int 1186 ocreat(struct thread *td, struct ocreat_args *uap) 1187 { 1188 1189 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1190 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1191 } 1192 #endif /* COMPAT_43 */ 1193 1194 /* 1195 * Create a special file. 1196 */ 1197 #ifndef _SYS_SYSPROTO_H_ 1198 struct mknodat_args { 1199 int fd; 1200 char *path; 1201 mode_t mode; 1202 dev_t dev; 1203 }; 1204 #endif 1205 int 1206 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1207 { 1208 1209 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1210 uap->dev)); 1211 } 1212 1213 #if defined(COMPAT_FREEBSD11) 1214 int 1215 freebsd11_mknod(struct thread *td, 1216 struct freebsd11_mknod_args *uap) 1217 { 1218 1219 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1220 uap->mode, uap->dev)); 1221 } 1222 1223 int 1224 freebsd11_mknodat(struct thread *td, 1225 struct freebsd11_mknodat_args *uap) 1226 { 1227 1228 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1229 uap->dev)); 1230 } 1231 #endif /* COMPAT_FREEBSD11 */ 1232 1233 int 1234 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1235 int mode, dev_t dev) 1236 { 1237 struct vnode *vp; 1238 struct mount *mp; 1239 struct vattr vattr; 1240 struct nameidata nd; 1241 cap_rights_t rights; 1242 int error, whiteout = 0; 1243 1244 AUDIT_ARG_MODE(mode); 1245 AUDIT_ARG_DEV(dev); 1246 switch (mode & S_IFMT) { 1247 case S_IFCHR: 1248 case S_IFBLK: 1249 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1250 if (error == 0 && dev == VNOVAL) 1251 error = EINVAL; 1252 break; 1253 case S_IFWHT: 1254 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1255 break; 1256 case S_IFIFO: 1257 if (dev == 0) 1258 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1259 /* FALLTHROUGH */ 1260 default: 1261 error = EINVAL; 1262 break; 1263 } 1264 if (error != 0) 1265 return (error); 1266 restart: 1267 bwillwrite(); 1268 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1269 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKNODAT), 1270 td); 1271 if ((error = namei(&nd)) != 0) 1272 return (error); 1273 vp = nd.ni_vp; 1274 if (vp != NULL) { 1275 NDFREE(&nd, NDF_ONLY_PNBUF); 1276 if (vp == nd.ni_dvp) 1277 vrele(nd.ni_dvp); 1278 else 1279 vput(nd.ni_dvp); 1280 vrele(vp); 1281 return (EEXIST); 1282 } else { 1283 VATTR_NULL(&vattr); 1284 vattr.va_mode = (mode & ALLPERMS) & 1285 ~td->td_proc->p_fd->fd_cmask; 1286 vattr.va_rdev = dev; 1287 whiteout = 0; 1288 1289 switch (mode & S_IFMT) { 1290 case S_IFCHR: 1291 vattr.va_type = VCHR; 1292 break; 1293 case S_IFBLK: 1294 vattr.va_type = VBLK; 1295 break; 1296 case S_IFWHT: 1297 whiteout = 1; 1298 break; 1299 default: 1300 panic("kern_mknod: invalid mode"); 1301 } 1302 } 1303 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1304 NDFREE(&nd, NDF_ONLY_PNBUF); 1305 vput(nd.ni_dvp); 1306 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1307 return (error); 1308 goto restart; 1309 } 1310 #ifdef MAC 1311 if (error == 0 && !whiteout) 1312 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1313 &nd.ni_cnd, &vattr); 1314 #endif 1315 if (error == 0) { 1316 if (whiteout) 1317 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1318 else { 1319 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1320 &nd.ni_cnd, &vattr); 1321 if (error == 0) 1322 vput(nd.ni_vp); 1323 } 1324 } 1325 NDFREE(&nd, NDF_ONLY_PNBUF); 1326 vput(nd.ni_dvp); 1327 vn_finished_write(mp); 1328 return (error); 1329 } 1330 1331 /* 1332 * Create a named pipe. 1333 */ 1334 #ifndef _SYS_SYSPROTO_H_ 1335 struct mkfifo_args { 1336 char *path; 1337 int mode; 1338 }; 1339 #endif 1340 int 1341 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1342 { 1343 1344 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1345 uap->mode)); 1346 } 1347 1348 #ifndef _SYS_SYSPROTO_H_ 1349 struct mkfifoat_args { 1350 int fd; 1351 char *path; 1352 mode_t mode; 1353 }; 1354 #endif 1355 int 1356 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1357 { 1358 1359 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1360 uap->mode)); 1361 } 1362 1363 int 1364 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1365 int mode) 1366 { 1367 struct mount *mp; 1368 struct vattr vattr; 1369 struct nameidata nd; 1370 cap_rights_t rights; 1371 int error; 1372 1373 AUDIT_ARG_MODE(mode); 1374 restart: 1375 bwillwrite(); 1376 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1377 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKFIFOAT), 1378 td); 1379 if ((error = namei(&nd)) != 0) 1380 return (error); 1381 if (nd.ni_vp != NULL) { 1382 NDFREE(&nd, NDF_ONLY_PNBUF); 1383 if (nd.ni_vp == nd.ni_dvp) 1384 vrele(nd.ni_dvp); 1385 else 1386 vput(nd.ni_dvp); 1387 vrele(nd.ni_vp); 1388 return (EEXIST); 1389 } 1390 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1391 NDFREE(&nd, NDF_ONLY_PNBUF); 1392 vput(nd.ni_dvp); 1393 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1394 return (error); 1395 goto restart; 1396 } 1397 VATTR_NULL(&vattr); 1398 vattr.va_type = VFIFO; 1399 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1400 #ifdef MAC 1401 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1402 &vattr); 1403 if (error != 0) 1404 goto out; 1405 #endif 1406 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1407 if (error == 0) 1408 vput(nd.ni_vp); 1409 #ifdef MAC 1410 out: 1411 #endif 1412 vput(nd.ni_dvp); 1413 vn_finished_write(mp); 1414 NDFREE(&nd, NDF_ONLY_PNBUF); 1415 return (error); 1416 } 1417 1418 /* 1419 * Make a hard file link. 1420 */ 1421 #ifndef _SYS_SYSPROTO_H_ 1422 struct link_args { 1423 char *path; 1424 char *link; 1425 }; 1426 #endif 1427 int 1428 sys_link(struct thread *td, struct link_args *uap) 1429 { 1430 1431 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1432 UIO_USERSPACE, FOLLOW)); 1433 } 1434 1435 #ifndef _SYS_SYSPROTO_H_ 1436 struct linkat_args { 1437 int fd1; 1438 char *path1; 1439 int fd2; 1440 char *path2; 1441 int flag; 1442 }; 1443 #endif 1444 int 1445 sys_linkat(struct thread *td, struct linkat_args *uap) 1446 { 1447 int flag; 1448 1449 flag = uap->flag; 1450 if (flag & ~AT_SYMLINK_FOLLOW) 1451 return (EINVAL); 1452 1453 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1454 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW)); 1455 } 1456 1457 int hardlink_check_uid = 0; 1458 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1459 &hardlink_check_uid, 0, 1460 "Unprivileged processes cannot create hard links to files owned by other " 1461 "users"); 1462 static int hardlink_check_gid = 0; 1463 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1464 &hardlink_check_gid, 0, 1465 "Unprivileged processes cannot create hard links to files owned by other " 1466 "groups"); 1467 1468 static int 1469 can_hardlink(struct vnode *vp, struct ucred *cred) 1470 { 1471 struct vattr va; 1472 int error; 1473 1474 if (!hardlink_check_uid && !hardlink_check_gid) 1475 return (0); 1476 1477 error = VOP_GETATTR(vp, &va, cred); 1478 if (error != 0) 1479 return (error); 1480 1481 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1482 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1483 if (error != 0) 1484 return (error); 1485 } 1486 1487 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1488 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1489 if (error != 0) 1490 return (error); 1491 } 1492 1493 return (0); 1494 } 1495 1496 int 1497 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2, 1498 enum uio_seg segflg, int follow) 1499 { 1500 struct vnode *vp; 1501 struct mount *mp; 1502 struct nameidata nd; 1503 cap_rights_t rights; 1504 int error; 1505 1506 again: 1507 bwillwrite(); 1508 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflg, path1, fd1, 1509 cap_rights_init(&rights, CAP_LINKAT_SOURCE), td); 1510 1511 if ((error = namei(&nd)) != 0) 1512 return (error); 1513 NDFREE(&nd, NDF_ONLY_PNBUF); 1514 vp = nd.ni_vp; 1515 if (vp->v_type == VDIR) { 1516 vrele(vp); 1517 return (EPERM); /* POSIX */ 1518 } 1519 NDINIT_ATRIGHTS(&nd, CREATE, 1520 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflg, path2, fd2, 1521 cap_rights_init(&rights, CAP_LINKAT_TARGET), td); 1522 if ((error = namei(&nd)) == 0) { 1523 if (nd.ni_vp != NULL) { 1524 NDFREE(&nd, NDF_ONLY_PNBUF); 1525 if (nd.ni_dvp == nd.ni_vp) 1526 vrele(nd.ni_dvp); 1527 else 1528 vput(nd.ni_dvp); 1529 vrele(nd.ni_vp); 1530 vrele(vp); 1531 return (EEXIST); 1532 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1533 /* 1534 * Cross-device link. No need to recheck 1535 * vp->v_type, since it cannot change, except 1536 * to VBAD. 1537 */ 1538 NDFREE(&nd, NDF_ONLY_PNBUF); 1539 vput(nd.ni_dvp); 1540 vrele(vp); 1541 return (EXDEV); 1542 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1543 error = can_hardlink(vp, td->td_ucred); 1544 #ifdef MAC 1545 if (error == 0) 1546 error = mac_vnode_check_link(td->td_ucred, 1547 nd.ni_dvp, vp, &nd.ni_cnd); 1548 #endif 1549 if (error != 0) { 1550 vput(vp); 1551 vput(nd.ni_dvp); 1552 NDFREE(&nd, NDF_ONLY_PNBUF); 1553 return (error); 1554 } 1555 error = vn_start_write(vp, &mp, V_NOWAIT); 1556 if (error != 0) { 1557 vput(vp); 1558 vput(nd.ni_dvp); 1559 NDFREE(&nd, NDF_ONLY_PNBUF); 1560 error = vn_start_write(NULL, &mp, 1561 V_XSLEEP | PCATCH); 1562 if (error != 0) 1563 return (error); 1564 goto again; 1565 } 1566 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1567 VOP_UNLOCK(vp, 0); 1568 vput(nd.ni_dvp); 1569 vn_finished_write(mp); 1570 NDFREE(&nd, NDF_ONLY_PNBUF); 1571 } else { 1572 vput(nd.ni_dvp); 1573 NDFREE(&nd, NDF_ONLY_PNBUF); 1574 vrele(vp); 1575 goto again; 1576 } 1577 } 1578 vrele(vp); 1579 return (error); 1580 } 1581 1582 /* 1583 * Make a symbolic link. 1584 */ 1585 #ifndef _SYS_SYSPROTO_H_ 1586 struct symlink_args { 1587 char *path; 1588 char *link; 1589 }; 1590 #endif 1591 int 1592 sys_symlink(struct thread *td, struct symlink_args *uap) 1593 { 1594 1595 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1596 UIO_USERSPACE)); 1597 } 1598 1599 #ifndef _SYS_SYSPROTO_H_ 1600 struct symlinkat_args { 1601 char *path; 1602 int fd; 1603 char *path2; 1604 }; 1605 #endif 1606 int 1607 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1608 { 1609 1610 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1611 UIO_USERSPACE)); 1612 } 1613 1614 int 1615 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2, 1616 enum uio_seg segflg) 1617 { 1618 struct mount *mp; 1619 struct vattr vattr; 1620 char *syspath; 1621 struct nameidata nd; 1622 int error; 1623 cap_rights_t rights; 1624 1625 if (segflg == UIO_SYSSPACE) { 1626 syspath = path1; 1627 } else { 1628 syspath = uma_zalloc(namei_zone, M_WAITOK); 1629 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0) 1630 goto out; 1631 } 1632 AUDIT_ARG_TEXT(syspath); 1633 restart: 1634 bwillwrite(); 1635 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1636 NOCACHE, segflg, path2, fd, cap_rights_init(&rights, CAP_SYMLINKAT), 1637 td); 1638 if ((error = namei(&nd)) != 0) 1639 goto out; 1640 if (nd.ni_vp) { 1641 NDFREE(&nd, NDF_ONLY_PNBUF); 1642 if (nd.ni_vp == nd.ni_dvp) 1643 vrele(nd.ni_dvp); 1644 else 1645 vput(nd.ni_dvp); 1646 vrele(nd.ni_vp); 1647 error = EEXIST; 1648 goto out; 1649 } 1650 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1651 NDFREE(&nd, NDF_ONLY_PNBUF); 1652 vput(nd.ni_dvp); 1653 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1654 goto out; 1655 goto restart; 1656 } 1657 VATTR_NULL(&vattr); 1658 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1659 #ifdef MAC 1660 vattr.va_type = VLNK; 1661 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1662 &vattr); 1663 if (error != 0) 1664 goto out2; 1665 #endif 1666 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1667 if (error == 0) 1668 vput(nd.ni_vp); 1669 #ifdef MAC 1670 out2: 1671 #endif 1672 NDFREE(&nd, NDF_ONLY_PNBUF); 1673 vput(nd.ni_dvp); 1674 vn_finished_write(mp); 1675 out: 1676 if (segflg != UIO_SYSSPACE) 1677 uma_zfree(namei_zone, syspath); 1678 return (error); 1679 } 1680 1681 /* 1682 * Delete a whiteout from the filesystem. 1683 */ 1684 #ifndef _SYS_SYSPROTO_H_ 1685 struct undelete_args { 1686 char *path; 1687 }; 1688 #endif 1689 int 1690 sys_undelete(struct thread *td, struct undelete_args *uap) 1691 { 1692 struct mount *mp; 1693 struct nameidata nd; 1694 int error; 1695 1696 restart: 1697 bwillwrite(); 1698 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1699 UIO_USERSPACE, uap->path, td); 1700 error = namei(&nd); 1701 if (error != 0) 1702 return (error); 1703 1704 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1705 NDFREE(&nd, NDF_ONLY_PNBUF); 1706 if (nd.ni_vp == nd.ni_dvp) 1707 vrele(nd.ni_dvp); 1708 else 1709 vput(nd.ni_dvp); 1710 if (nd.ni_vp) 1711 vrele(nd.ni_vp); 1712 return (EEXIST); 1713 } 1714 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1715 NDFREE(&nd, NDF_ONLY_PNBUF); 1716 vput(nd.ni_dvp); 1717 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1718 return (error); 1719 goto restart; 1720 } 1721 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1722 NDFREE(&nd, NDF_ONLY_PNBUF); 1723 vput(nd.ni_dvp); 1724 vn_finished_write(mp); 1725 return (error); 1726 } 1727 1728 /* 1729 * Delete a name from the filesystem. 1730 */ 1731 #ifndef _SYS_SYSPROTO_H_ 1732 struct unlink_args { 1733 char *path; 1734 }; 1735 #endif 1736 int 1737 sys_unlink(struct thread *td, struct unlink_args *uap) 1738 { 1739 1740 return (kern_unlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0)); 1741 } 1742 1743 #ifndef _SYS_SYSPROTO_H_ 1744 struct unlinkat_args { 1745 int fd; 1746 char *path; 1747 int flag; 1748 }; 1749 #endif 1750 int 1751 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1752 { 1753 int flag = uap->flag; 1754 int fd = uap->fd; 1755 char *path = uap->path; 1756 1757 if (flag & ~AT_REMOVEDIR) 1758 return (EINVAL); 1759 1760 if (flag & AT_REMOVEDIR) 1761 return (kern_rmdirat(td, fd, path, UIO_USERSPACE)); 1762 else 1763 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0)); 1764 } 1765 1766 int 1767 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1768 ino_t oldinum) 1769 { 1770 struct mount *mp; 1771 struct vnode *vp; 1772 struct nameidata nd; 1773 struct stat sb; 1774 cap_rights_t rights; 1775 int error; 1776 1777 restart: 1778 bwillwrite(); 1779 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, 1780 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td); 1781 if ((error = namei(&nd)) != 0) 1782 return (error == EINVAL ? EPERM : error); 1783 vp = nd.ni_vp; 1784 if (vp->v_type == VDIR && oldinum == 0) { 1785 error = EPERM; /* POSIX */ 1786 } else if (oldinum != 0 && 1787 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1788 sb.st_ino != oldinum) { 1789 error = EIDRM; /* Identifier removed */ 1790 } else { 1791 /* 1792 * The root of a mounted filesystem cannot be deleted. 1793 * 1794 * XXX: can this only be a VDIR case? 1795 */ 1796 if (vp->v_vflag & VV_ROOT) 1797 error = EBUSY; 1798 } 1799 if (error == 0) { 1800 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1801 NDFREE(&nd, NDF_ONLY_PNBUF); 1802 vput(nd.ni_dvp); 1803 if (vp == nd.ni_dvp) 1804 vrele(vp); 1805 else 1806 vput(vp); 1807 if ((error = vn_start_write(NULL, &mp, 1808 V_XSLEEP | PCATCH)) != 0) 1809 return (error); 1810 goto restart; 1811 } 1812 #ifdef MAC 1813 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1814 &nd.ni_cnd); 1815 if (error != 0) 1816 goto out; 1817 #endif 1818 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1819 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1820 #ifdef MAC 1821 out: 1822 #endif 1823 vn_finished_write(mp); 1824 } 1825 NDFREE(&nd, NDF_ONLY_PNBUF); 1826 vput(nd.ni_dvp); 1827 if (vp == nd.ni_dvp) 1828 vrele(vp); 1829 else 1830 vput(vp); 1831 return (error); 1832 } 1833 1834 /* 1835 * Reposition read/write file offset. 1836 */ 1837 #ifndef _SYS_SYSPROTO_H_ 1838 struct lseek_args { 1839 int fd; 1840 int pad; 1841 off_t offset; 1842 int whence; 1843 }; 1844 #endif 1845 int 1846 sys_lseek(struct thread *td, struct lseek_args *uap) 1847 { 1848 1849 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1850 } 1851 1852 int 1853 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1854 { 1855 struct file *fp; 1856 cap_rights_t rights; 1857 int error; 1858 1859 AUDIT_ARG_FD(fd); 1860 error = fget(td, fd, cap_rights_init(&rights, CAP_SEEK), &fp); 1861 if (error != 0) 1862 return (error); 1863 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1864 fo_seek(fp, offset, whence, td) : ESPIPE; 1865 fdrop(fp, td); 1866 return (error); 1867 } 1868 1869 #if defined(COMPAT_43) 1870 /* 1871 * Reposition read/write file offset. 1872 */ 1873 #ifndef _SYS_SYSPROTO_H_ 1874 struct olseek_args { 1875 int fd; 1876 long offset; 1877 int whence; 1878 }; 1879 #endif 1880 int 1881 olseek(struct thread *td, struct olseek_args *uap) 1882 { 1883 1884 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1885 } 1886 #endif /* COMPAT_43 */ 1887 1888 #if defined(COMPAT_FREEBSD6) 1889 /* Version with the 'pad' argument */ 1890 int 1891 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 1892 { 1893 1894 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1895 } 1896 #endif 1897 1898 /* 1899 * Check access permissions using passed credentials. 1900 */ 1901 static int 1902 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 1903 struct thread *td) 1904 { 1905 accmode_t accmode; 1906 int error; 1907 1908 /* Flags == 0 means only check for existence. */ 1909 if (user_flags == 0) 1910 return (0); 1911 1912 accmode = 0; 1913 if (user_flags & R_OK) 1914 accmode |= VREAD; 1915 if (user_flags & W_OK) 1916 accmode |= VWRITE; 1917 if (user_flags & X_OK) 1918 accmode |= VEXEC; 1919 #ifdef MAC 1920 error = mac_vnode_check_access(cred, vp, accmode); 1921 if (error != 0) 1922 return (error); 1923 #endif 1924 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1925 error = VOP_ACCESS(vp, accmode, cred, td); 1926 return (error); 1927 } 1928 1929 /* 1930 * Check access permissions using "real" credentials. 1931 */ 1932 #ifndef _SYS_SYSPROTO_H_ 1933 struct access_args { 1934 char *path; 1935 int amode; 1936 }; 1937 #endif 1938 int 1939 sys_access(struct thread *td, struct access_args *uap) 1940 { 1941 1942 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1943 0, uap->amode)); 1944 } 1945 1946 #ifndef _SYS_SYSPROTO_H_ 1947 struct faccessat_args { 1948 int dirfd; 1949 char *path; 1950 int amode; 1951 int flag; 1952 } 1953 #endif 1954 int 1955 sys_faccessat(struct thread *td, struct faccessat_args *uap) 1956 { 1957 1958 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1959 uap->amode)); 1960 } 1961 1962 int 1963 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1964 int flag, int amode) 1965 { 1966 struct ucred *cred, *usecred; 1967 struct vnode *vp; 1968 struct nameidata nd; 1969 cap_rights_t rights; 1970 int error; 1971 1972 if (flag & ~AT_EACCESS) 1973 return (EINVAL); 1974 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 1975 return (EINVAL); 1976 1977 /* 1978 * Create and modify a temporary credential instead of one that 1979 * is potentially shared (if we need one). 1980 */ 1981 cred = td->td_ucred; 1982 if ((flag & AT_EACCESS) == 0 && 1983 ((cred->cr_uid != cred->cr_ruid || 1984 cred->cr_rgid != cred->cr_groups[0]))) { 1985 usecred = crdup(cred); 1986 usecred->cr_uid = cred->cr_ruid; 1987 usecred->cr_groups[0] = cred->cr_rgid; 1988 td->td_ucred = usecred; 1989 } else 1990 usecred = cred; 1991 AUDIT_ARG_VALUE(amode); 1992 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 1993 AUDITVNODE1, pathseg, path, fd, cap_rights_init(&rights, CAP_FSTAT), 1994 td); 1995 if ((error = namei(&nd)) != 0) 1996 goto out; 1997 vp = nd.ni_vp; 1998 1999 error = vn_access(vp, amode, usecred, td); 2000 NDFREE(&nd, NDF_ONLY_PNBUF); 2001 vput(vp); 2002 out: 2003 if (usecred != cred) { 2004 td->td_ucred = cred; 2005 crfree(usecred); 2006 } 2007 return (error); 2008 } 2009 2010 /* 2011 * Check access permissions using "effective" credentials. 2012 */ 2013 #ifndef _SYS_SYSPROTO_H_ 2014 struct eaccess_args { 2015 char *path; 2016 int amode; 2017 }; 2018 #endif 2019 int 2020 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2021 { 2022 2023 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2024 AT_EACCESS, uap->amode)); 2025 } 2026 2027 #if defined(COMPAT_43) 2028 /* 2029 * Get file status; this version follows links. 2030 */ 2031 #ifndef _SYS_SYSPROTO_H_ 2032 struct ostat_args { 2033 char *path; 2034 struct ostat *ub; 2035 }; 2036 #endif 2037 int 2038 ostat(struct thread *td, struct ostat_args *uap) 2039 { 2040 struct stat sb; 2041 struct ostat osb; 2042 int error; 2043 2044 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2045 &sb, NULL); 2046 if (error != 0) 2047 return (error); 2048 cvtstat(&sb, &osb); 2049 return (copyout(&osb, uap->ub, sizeof (osb))); 2050 } 2051 2052 /* 2053 * Get file status; this version does not follow links. 2054 */ 2055 #ifndef _SYS_SYSPROTO_H_ 2056 struct olstat_args { 2057 char *path; 2058 struct ostat *ub; 2059 }; 2060 #endif 2061 int 2062 olstat(struct thread *td, struct olstat_args *uap) 2063 { 2064 struct stat sb; 2065 struct ostat osb; 2066 int error; 2067 2068 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2069 UIO_USERSPACE, &sb, NULL); 2070 if (error != 0) 2071 return (error); 2072 cvtstat(&sb, &osb); 2073 return (copyout(&osb, uap->ub, sizeof (osb))); 2074 } 2075 2076 /* 2077 * Convert from an old to a new stat structure. 2078 */ 2079 void 2080 cvtstat(struct stat *st, struct ostat *ost) 2081 { 2082 2083 bzero(ost, sizeof(*ost)); 2084 ost->st_dev = st->st_dev; 2085 ost->st_ino = st->st_ino; 2086 ost->st_mode = st->st_mode; 2087 ost->st_nlink = st->st_nlink; 2088 ost->st_uid = st->st_uid; 2089 ost->st_gid = st->st_gid; 2090 ost->st_rdev = st->st_rdev; 2091 if (st->st_size < (quad_t)1 << 32) 2092 ost->st_size = st->st_size; 2093 else 2094 ost->st_size = -2; 2095 ost->st_atim = st->st_atim; 2096 ost->st_mtim = st->st_mtim; 2097 ost->st_ctim = st->st_ctim; 2098 ost->st_blksize = st->st_blksize; 2099 ost->st_blocks = st->st_blocks; 2100 ost->st_flags = st->st_flags; 2101 ost->st_gen = st->st_gen; 2102 } 2103 #endif /* COMPAT_43 */ 2104 2105 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 2106 int ino64_trunc_error; 2107 SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, 2108 &ino64_trunc_error, 0, 2109 "Error on truncation of inode number, device id or link count"); 2110 int 2111 freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) 2112 { 2113 2114 ost->st_dev = st->st_dev; 2115 ost->st_ino = st->st_ino; 2116 if (ost->st_ino != st->st_ino) { 2117 switch (ino64_trunc_error) { 2118 default: 2119 case 0: 2120 break; 2121 case 1: 2122 return (EOVERFLOW); 2123 case 2: 2124 ost->st_ino = UINT32_MAX; 2125 break; 2126 } 2127 } 2128 ost->st_mode = st->st_mode; 2129 ost->st_nlink = st->st_nlink; 2130 if (ost->st_nlink != st->st_nlink) { 2131 switch (ino64_trunc_error) { 2132 default: 2133 case 0: 2134 break; 2135 case 1: 2136 return (EOVERFLOW); 2137 case 2: 2138 ost->st_nlink = UINT16_MAX; 2139 break; 2140 } 2141 } 2142 ost->st_uid = st->st_uid; 2143 ost->st_gid = st->st_gid; 2144 ost->st_rdev = st->st_rdev; 2145 ost->st_atim = st->st_atim; 2146 ost->st_mtim = st->st_mtim; 2147 ost->st_ctim = st->st_ctim; 2148 ost->st_size = st->st_size; 2149 ost->st_blocks = st->st_blocks; 2150 ost->st_blksize = st->st_blksize; 2151 ost->st_flags = st->st_flags; 2152 ost->st_gen = st->st_gen; 2153 ost->st_lspare = 0; 2154 ost->st_birthtim = st->st_birthtim; 2155 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2156 sizeof(*ost) - offsetof(struct freebsd11_stat, 2157 st_birthtim) - sizeof(ost->st_birthtim)); 2158 return (0); 2159 } 2160 2161 int 2162 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2163 { 2164 struct stat sb; 2165 struct freebsd11_stat osb; 2166 int error; 2167 2168 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2169 &sb, NULL); 2170 if (error != 0) 2171 return (error); 2172 error = freebsd11_cvtstat(&sb, &osb); 2173 if (error == 0) 2174 error = copyout(&osb, uap->ub, sizeof(osb)); 2175 return (error); 2176 } 2177 2178 int 2179 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2180 { 2181 struct stat sb; 2182 struct freebsd11_stat osb; 2183 int error; 2184 2185 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2186 UIO_USERSPACE, &sb, NULL); 2187 if (error != 0) 2188 return (error); 2189 error = freebsd11_cvtstat(&sb, &osb); 2190 if (error == 0) 2191 error = copyout(&osb, uap->ub, sizeof(osb)); 2192 return (error); 2193 } 2194 2195 int 2196 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2197 { 2198 struct fhandle fh; 2199 struct stat sb; 2200 struct freebsd11_stat osb; 2201 int error; 2202 2203 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2204 if (error != 0) 2205 return (error); 2206 error = kern_fhstat(td, fh, &sb); 2207 if (error != 0) 2208 return (error); 2209 error = freebsd11_cvtstat(&sb, &osb); 2210 if (error == 0) 2211 error = copyout(&osb, uap->sb, sizeof(osb)); 2212 return (error); 2213 } 2214 2215 int 2216 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2217 { 2218 struct stat sb; 2219 struct freebsd11_stat osb; 2220 int error; 2221 2222 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2223 UIO_USERSPACE, &sb, NULL); 2224 if (error != 0) 2225 return (error); 2226 error = freebsd11_cvtstat(&sb, &osb); 2227 if (error == 0) 2228 error = copyout(&osb, uap->buf, sizeof(osb)); 2229 return (error); 2230 } 2231 #endif /* COMPAT_FREEBSD11 */ 2232 2233 /* 2234 * Get file status 2235 */ 2236 #ifndef _SYS_SYSPROTO_H_ 2237 struct fstatat_args { 2238 int fd; 2239 char *path; 2240 struct stat *buf; 2241 int flag; 2242 } 2243 #endif 2244 int 2245 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2246 { 2247 struct stat sb; 2248 int error; 2249 2250 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2251 UIO_USERSPACE, &sb, NULL); 2252 if (error == 0) 2253 error = copyout(&sb, uap->buf, sizeof (sb)); 2254 return (error); 2255 } 2256 2257 int 2258 kern_statat(struct thread *td, int flag, int fd, char *path, 2259 enum uio_seg pathseg, struct stat *sbp, 2260 void (*hook)(struct vnode *vp, struct stat *sbp)) 2261 { 2262 struct nameidata nd; 2263 struct stat sb; 2264 cap_rights_t rights; 2265 int error; 2266 2267 if (flag & ~AT_SYMLINK_NOFOLLOW) 2268 return (EINVAL); 2269 2270 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 2271 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd, 2272 cap_rights_init(&rights, CAP_FSTAT), td); 2273 2274 if ((error = namei(&nd)) != 0) 2275 return (error); 2276 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 2277 if (error == 0) { 2278 SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode); 2279 if (S_ISREG(sb.st_mode)) 2280 SDT_PROBE2(vfs, , stat, reg, path, pathseg); 2281 if (__predict_false(hook != NULL)) 2282 hook(nd.ni_vp, &sb); 2283 } 2284 NDFREE(&nd, NDF_ONLY_PNBUF); 2285 vput(nd.ni_vp); 2286 if (error != 0) 2287 return (error); 2288 #ifdef __STAT_TIME_T_EXT 2289 sb.st_atim_ext = 0; 2290 sb.st_mtim_ext = 0; 2291 sb.st_ctim_ext = 0; 2292 sb.st_btim_ext = 0; 2293 #endif 2294 *sbp = sb; 2295 #ifdef KTRACE 2296 if (KTRPOINT(td, KTR_STRUCT)) 2297 ktrstat(&sb); 2298 #endif 2299 return (0); 2300 } 2301 2302 #if defined(COMPAT_FREEBSD11) 2303 /* 2304 * Implementation of the NetBSD [l]stat() functions. 2305 */ 2306 void 2307 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2308 { 2309 2310 bzero(nsb, sizeof(*nsb)); 2311 nsb->st_dev = sb->st_dev; 2312 nsb->st_ino = sb->st_ino; 2313 nsb->st_mode = sb->st_mode; 2314 nsb->st_nlink = sb->st_nlink; 2315 nsb->st_uid = sb->st_uid; 2316 nsb->st_gid = sb->st_gid; 2317 nsb->st_rdev = sb->st_rdev; 2318 nsb->st_atim = sb->st_atim; 2319 nsb->st_mtim = sb->st_mtim; 2320 nsb->st_ctim = sb->st_ctim; 2321 nsb->st_size = sb->st_size; 2322 nsb->st_blocks = sb->st_blocks; 2323 nsb->st_blksize = sb->st_blksize; 2324 nsb->st_flags = sb->st_flags; 2325 nsb->st_gen = sb->st_gen; 2326 nsb->st_birthtim = sb->st_birthtim; 2327 } 2328 2329 #ifndef _SYS_SYSPROTO_H_ 2330 struct freebsd11_nstat_args { 2331 char *path; 2332 struct nstat *ub; 2333 }; 2334 #endif 2335 int 2336 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2337 { 2338 struct stat sb; 2339 struct nstat nsb; 2340 int error; 2341 2342 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2343 &sb, NULL); 2344 if (error != 0) 2345 return (error); 2346 freebsd11_cvtnstat(&sb, &nsb); 2347 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2348 } 2349 2350 /* 2351 * NetBSD lstat. Get file status; this version does not follow links. 2352 */ 2353 #ifndef _SYS_SYSPROTO_H_ 2354 struct freebsd11_nlstat_args { 2355 char *path; 2356 struct nstat *ub; 2357 }; 2358 #endif 2359 int 2360 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2361 { 2362 struct stat sb; 2363 struct nstat nsb; 2364 int error; 2365 2366 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2367 UIO_USERSPACE, &sb, NULL); 2368 if (error != 0) 2369 return (error); 2370 freebsd11_cvtnstat(&sb, &nsb); 2371 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2372 } 2373 #endif /* COMPAT_FREEBSD11 */ 2374 2375 /* 2376 * Get configurable pathname variables. 2377 */ 2378 #ifndef _SYS_SYSPROTO_H_ 2379 struct pathconf_args { 2380 char *path; 2381 int name; 2382 }; 2383 #endif 2384 int 2385 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2386 { 2387 long value; 2388 int error; 2389 2390 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, 2391 &value); 2392 if (error == 0) 2393 td->td_retval[0] = value; 2394 return (error); 2395 } 2396 2397 #ifndef _SYS_SYSPROTO_H_ 2398 struct lpathconf_args { 2399 char *path; 2400 int name; 2401 }; 2402 #endif 2403 int 2404 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2405 { 2406 long value; 2407 int error; 2408 2409 error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2410 NOFOLLOW, &value); 2411 if (error == 0) 2412 td->td_retval[0] = value; 2413 return (error); 2414 } 2415 2416 int 2417 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name, 2418 u_long flags, long *valuep) 2419 { 2420 struct nameidata nd; 2421 int error; 2422 2423 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2424 pathseg, path, td); 2425 if ((error = namei(&nd)) != 0) 2426 return (error); 2427 NDFREE(&nd, NDF_ONLY_PNBUF); 2428 2429 error = VOP_PATHCONF(nd.ni_vp, name, valuep); 2430 vput(nd.ni_vp); 2431 return (error); 2432 } 2433 2434 /* 2435 * Return target name of a symbolic link. 2436 */ 2437 #ifndef _SYS_SYSPROTO_H_ 2438 struct readlink_args { 2439 char *path; 2440 char *buf; 2441 size_t count; 2442 }; 2443 #endif 2444 int 2445 sys_readlink(struct thread *td, struct readlink_args *uap) 2446 { 2447 2448 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2449 uap->buf, UIO_USERSPACE, uap->count)); 2450 } 2451 #ifndef _SYS_SYSPROTO_H_ 2452 struct readlinkat_args { 2453 int fd; 2454 char *path; 2455 char *buf; 2456 size_t bufsize; 2457 }; 2458 #endif 2459 int 2460 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2461 { 2462 2463 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2464 uap->buf, UIO_USERSPACE, uap->bufsize)); 2465 } 2466 2467 int 2468 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2469 char *buf, enum uio_seg bufseg, size_t count) 2470 { 2471 struct vnode *vp; 2472 struct iovec aiov; 2473 struct uio auio; 2474 struct nameidata nd; 2475 int error; 2476 2477 if (count > IOSIZE_MAX) 2478 return (EINVAL); 2479 2480 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2481 pathseg, path, fd, td); 2482 2483 if ((error = namei(&nd)) != 0) 2484 return (error); 2485 NDFREE(&nd, NDF_ONLY_PNBUF); 2486 vp = nd.ni_vp; 2487 #ifdef MAC 2488 error = mac_vnode_check_readlink(td->td_ucred, vp); 2489 if (error != 0) { 2490 vput(vp); 2491 return (error); 2492 } 2493 #endif 2494 if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) 2495 error = EINVAL; 2496 else { 2497 aiov.iov_base = buf; 2498 aiov.iov_len = count; 2499 auio.uio_iov = &aiov; 2500 auio.uio_iovcnt = 1; 2501 auio.uio_offset = 0; 2502 auio.uio_rw = UIO_READ; 2503 auio.uio_segflg = bufseg; 2504 auio.uio_td = td; 2505 auio.uio_resid = count; 2506 error = VOP_READLINK(vp, &auio, td->td_ucred); 2507 td->td_retval[0] = count - auio.uio_resid; 2508 } 2509 vput(vp); 2510 return (error); 2511 } 2512 2513 /* 2514 * Common implementation code for chflags() and fchflags(). 2515 */ 2516 static int 2517 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2518 { 2519 struct mount *mp; 2520 struct vattr vattr; 2521 int error; 2522 2523 /* We can't support the value matching VNOVAL. */ 2524 if (flags == VNOVAL) 2525 return (EOPNOTSUPP); 2526 2527 /* 2528 * Prevent non-root users from setting flags on devices. When 2529 * a device is reused, users can retain ownership of the device 2530 * if they are allowed to set flags and programs assume that 2531 * chown can't fail when done as root. 2532 */ 2533 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2534 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2535 if (error != 0) 2536 return (error); 2537 } 2538 2539 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2540 return (error); 2541 VATTR_NULL(&vattr); 2542 vattr.va_flags = flags; 2543 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2544 #ifdef MAC 2545 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2546 if (error == 0) 2547 #endif 2548 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2549 VOP_UNLOCK(vp, 0); 2550 vn_finished_write(mp); 2551 return (error); 2552 } 2553 2554 /* 2555 * Change flags of a file given a path name. 2556 */ 2557 #ifndef _SYS_SYSPROTO_H_ 2558 struct chflags_args { 2559 const char *path; 2560 u_long flags; 2561 }; 2562 #endif 2563 int 2564 sys_chflags(struct thread *td, struct chflags_args *uap) 2565 { 2566 2567 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2568 uap->flags, 0)); 2569 } 2570 2571 #ifndef _SYS_SYSPROTO_H_ 2572 struct chflagsat_args { 2573 int fd; 2574 const char *path; 2575 u_long flags; 2576 int atflag; 2577 } 2578 #endif 2579 int 2580 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2581 { 2582 int fd = uap->fd; 2583 const char *path = uap->path; 2584 u_long flags = uap->flags; 2585 int atflag = uap->atflag; 2586 2587 if (atflag & ~AT_SYMLINK_NOFOLLOW) 2588 return (EINVAL); 2589 2590 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag)); 2591 } 2592 2593 /* 2594 * Same as chflags() but doesn't follow symlinks. 2595 */ 2596 #ifndef _SYS_SYSPROTO_H_ 2597 struct lchflags_args { 2598 const char *path; 2599 u_long flags; 2600 }; 2601 #endif 2602 int 2603 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2604 { 2605 2606 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2607 uap->flags, AT_SYMLINK_NOFOLLOW)); 2608 } 2609 2610 static int 2611 kern_chflagsat(struct thread *td, int fd, const char *path, 2612 enum uio_seg pathseg, u_long flags, int atflag) 2613 { 2614 struct nameidata nd; 2615 cap_rights_t rights; 2616 int error, follow; 2617 2618 AUDIT_ARG_FFLAGS(flags); 2619 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2620 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2621 cap_rights_init(&rights, CAP_FCHFLAGS), td); 2622 if ((error = namei(&nd)) != 0) 2623 return (error); 2624 NDFREE(&nd, NDF_ONLY_PNBUF); 2625 error = setfflags(td, nd.ni_vp, flags); 2626 vrele(nd.ni_vp); 2627 return (error); 2628 } 2629 2630 /* 2631 * Change flags of a file given a file descriptor. 2632 */ 2633 #ifndef _SYS_SYSPROTO_H_ 2634 struct fchflags_args { 2635 int fd; 2636 u_long flags; 2637 }; 2638 #endif 2639 int 2640 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2641 { 2642 struct file *fp; 2643 cap_rights_t rights; 2644 int error; 2645 2646 AUDIT_ARG_FD(uap->fd); 2647 AUDIT_ARG_FFLAGS(uap->flags); 2648 error = getvnode(td, uap->fd, cap_rights_init(&rights, CAP_FCHFLAGS), 2649 &fp); 2650 if (error != 0) 2651 return (error); 2652 #ifdef AUDIT 2653 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2654 AUDIT_ARG_VNODE1(fp->f_vnode); 2655 VOP_UNLOCK(fp->f_vnode, 0); 2656 #endif 2657 error = setfflags(td, fp->f_vnode, uap->flags); 2658 fdrop(fp, td); 2659 return (error); 2660 } 2661 2662 /* 2663 * Common implementation code for chmod(), lchmod() and fchmod(). 2664 */ 2665 int 2666 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2667 { 2668 struct mount *mp; 2669 struct vattr vattr; 2670 int error; 2671 2672 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2673 return (error); 2674 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2675 VATTR_NULL(&vattr); 2676 vattr.va_mode = mode & ALLPERMS; 2677 #ifdef MAC 2678 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2679 if (error == 0) 2680 #endif 2681 error = VOP_SETATTR(vp, &vattr, cred); 2682 VOP_UNLOCK(vp, 0); 2683 vn_finished_write(mp); 2684 return (error); 2685 } 2686 2687 /* 2688 * Change mode of a file given path name. 2689 */ 2690 #ifndef _SYS_SYSPROTO_H_ 2691 struct chmod_args { 2692 char *path; 2693 int mode; 2694 }; 2695 #endif 2696 int 2697 sys_chmod(struct thread *td, struct chmod_args *uap) 2698 { 2699 2700 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2701 uap->mode, 0)); 2702 } 2703 2704 #ifndef _SYS_SYSPROTO_H_ 2705 struct fchmodat_args { 2706 int dirfd; 2707 char *path; 2708 mode_t mode; 2709 int flag; 2710 } 2711 #endif 2712 int 2713 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2714 { 2715 int flag = uap->flag; 2716 int fd = uap->fd; 2717 char *path = uap->path; 2718 mode_t mode = uap->mode; 2719 2720 if (flag & ~AT_SYMLINK_NOFOLLOW) 2721 return (EINVAL); 2722 2723 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag)); 2724 } 2725 2726 /* 2727 * Change mode of a file given path name (don't follow links.) 2728 */ 2729 #ifndef _SYS_SYSPROTO_H_ 2730 struct lchmod_args { 2731 char *path; 2732 int mode; 2733 }; 2734 #endif 2735 int 2736 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2737 { 2738 2739 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2740 uap->mode, AT_SYMLINK_NOFOLLOW)); 2741 } 2742 2743 int 2744 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2745 mode_t mode, int flag) 2746 { 2747 struct nameidata nd; 2748 cap_rights_t rights; 2749 int error, follow; 2750 2751 AUDIT_ARG_MODE(mode); 2752 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2753 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2754 cap_rights_init(&rights, CAP_FCHMOD), td); 2755 if ((error = namei(&nd)) != 0) 2756 return (error); 2757 NDFREE(&nd, NDF_ONLY_PNBUF); 2758 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2759 vrele(nd.ni_vp); 2760 return (error); 2761 } 2762 2763 /* 2764 * Change mode of a file given a file descriptor. 2765 */ 2766 #ifndef _SYS_SYSPROTO_H_ 2767 struct fchmod_args { 2768 int fd; 2769 int mode; 2770 }; 2771 #endif 2772 int 2773 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2774 { 2775 struct file *fp; 2776 cap_rights_t rights; 2777 int error; 2778 2779 AUDIT_ARG_FD(uap->fd); 2780 AUDIT_ARG_MODE(uap->mode); 2781 2782 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHMOD), &fp); 2783 if (error != 0) 2784 return (error); 2785 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2786 fdrop(fp, td); 2787 return (error); 2788 } 2789 2790 /* 2791 * Common implementation for chown(), lchown(), and fchown() 2792 */ 2793 int 2794 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2795 gid_t gid) 2796 { 2797 struct mount *mp; 2798 struct vattr vattr; 2799 int error; 2800 2801 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2802 return (error); 2803 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2804 VATTR_NULL(&vattr); 2805 vattr.va_uid = uid; 2806 vattr.va_gid = gid; 2807 #ifdef MAC 2808 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2809 vattr.va_gid); 2810 if (error == 0) 2811 #endif 2812 error = VOP_SETATTR(vp, &vattr, cred); 2813 VOP_UNLOCK(vp, 0); 2814 vn_finished_write(mp); 2815 return (error); 2816 } 2817 2818 /* 2819 * Set ownership given a path name. 2820 */ 2821 #ifndef _SYS_SYSPROTO_H_ 2822 struct chown_args { 2823 char *path; 2824 int uid; 2825 int gid; 2826 }; 2827 #endif 2828 int 2829 sys_chown(struct thread *td, struct chown_args *uap) 2830 { 2831 2832 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2833 uap->gid, 0)); 2834 } 2835 2836 #ifndef _SYS_SYSPROTO_H_ 2837 struct fchownat_args { 2838 int fd; 2839 const char * path; 2840 uid_t uid; 2841 gid_t gid; 2842 int flag; 2843 }; 2844 #endif 2845 int 2846 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2847 { 2848 int flag; 2849 2850 flag = uap->flag; 2851 if (flag & ~AT_SYMLINK_NOFOLLOW) 2852 return (EINVAL); 2853 2854 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 2855 uap->gid, uap->flag)); 2856 } 2857 2858 int 2859 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2860 int uid, int gid, int flag) 2861 { 2862 struct nameidata nd; 2863 cap_rights_t rights; 2864 int error, follow; 2865 2866 AUDIT_ARG_OWNER(uid, gid); 2867 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2868 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2869 cap_rights_init(&rights, CAP_FCHOWN), td); 2870 2871 if ((error = namei(&nd)) != 0) 2872 return (error); 2873 NDFREE(&nd, NDF_ONLY_PNBUF); 2874 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 2875 vrele(nd.ni_vp); 2876 return (error); 2877 } 2878 2879 /* 2880 * Set ownership given a path name, do not cross symlinks. 2881 */ 2882 #ifndef _SYS_SYSPROTO_H_ 2883 struct lchown_args { 2884 char *path; 2885 int uid; 2886 int gid; 2887 }; 2888 #endif 2889 int 2890 sys_lchown(struct thread *td, struct lchown_args *uap) 2891 { 2892 2893 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2894 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 2895 } 2896 2897 /* 2898 * Set ownership given a file descriptor. 2899 */ 2900 #ifndef _SYS_SYSPROTO_H_ 2901 struct fchown_args { 2902 int fd; 2903 int uid; 2904 int gid; 2905 }; 2906 #endif 2907 int 2908 sys_fchown(struct thread *td, struct fchown_args *uap) 2909 { 2910 struct file *fp; 2911 cap_rights_t rights; 2912 int error; 2913 2914 AUDIT_ARG_FD(uap->fd); 2915 AUDIT_ARG_OWNER(uap->uid, uap->gid); 2916 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHOWN), &fp); 2917 if (error != 0) 2918 return (error); 2919 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 2920 fdrop(fp, td); 2921 return (error); 2922 } 2923 2924 /* 2925 * Common implementation code for utimes(), lutimes(), and futimes(). 2926 */ 2927 static int 2928 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 2929 struct timespec *tsp) 2930 { 2931 struct timeval tv[2]; 2932 const struct timeval *tvp; 2933 int error; 2934 2935 if (usrtvp == NULL) { 2936 vfs_timestamp(&tsp[0]); 2937 tsp[1] = tsp[0]; 2938 } else { 2939 if (tvpseg == UIO_SYSSPACE) { 2940 tvp = usrtvp; 2941 } else { 2942 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 2943 return (error); 2944 tvp = tv; 2945 } 2946 2947 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 2948 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 2949 return (EINVAL); 2950 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 2951 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 2952 } 2953 return (0); 2954 } 2955 2956 /* 2957 * Common implementation code for futimens(), utimensat(). 2958 */ 2959 #define UTIMENS_NULL 0x1 2960 #define UTIMENS_EXIT 0x2 2961 static int 2962 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 2963 struct timespec *tsp, int *retflags) 2964 { 2965 struct timespec tsnow; 2966 int error; 2967 2968 vfs_timestamp(&tsnow); 2969 *retflags = 0; 2970 if (usrtsp == NULL) { 2971 tsp[0] = tsnow; 2972 tsp[1] = tsnow; 2973 *retflags |= UTIMENS_NULL; 2974 return (0); 2975 } 2976 if (tspseg == UIO_SYSSPACE) { 2977 tsp[0] = usrtsp[0]; 2978 tsp[1] = usrtsp[1]; 2979 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 2980 return (error); 2981 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 2982 *retflags |= UTIMENS_EXIT; 2983 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 2984 *retflags |= UTIMENS_NULL; 2985 if (tsp[0].tv_nsec == UTIME_OMIT) 2986 tsp[0].tv_sec = VNOVAL; 2987 else if (tsp[0].tv_nsec == UTIME_NOW) 2988 tsp[0] = tsnow; 2989 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 2990 return (EINVAL); 2991 if (tsp[1].tv_nsec == UTIME_OMIT) 2992 tsp[1].tv_sec = VNOVAL; 2993 else if (tsp[1].tv_nsec == UTIME_NOW) 2994 tsp[1] = tsnow; 2995 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 2996 return (EINVAL); 2997 2998 return (0); 2999 } 3000 3001 /* 3002 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 3003 * and utimensat(). 3004 */ 3005 static int 3006 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 3007 int numtimes, int nullflag) 3008 { 3009 struct mount *mp; 3010 struct vattr vattr; 3011 int error, setbirthtime; 3012 3013 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 3014 return (error); 3015 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3016 setbirthtime = 0; 3017 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 3018 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 3019 setbirthtime = 1; 3020 VATTR_NULL(&vattr); 3021 vattr.va_atime = ts[0]; 3022 vattr.va_mtime = ts[1]; 3023 if (setbirthtime) 3024 vattr.va_birthtime = ts[1]; 3025 if (numtimes > 2) 3026 vattr.va_birthtime = ts[2]; 3027 if (nullflag) 3028 vattr.va_vaflags |= VA_UTIMES_NULL; 3029 #ifdef MAC 3030 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 3031 vattr.va_mtime); 3032 #endif 3033 if (error == 0) 3034 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3035 VOP_UNLOCK(vp, 0); 3036 vn_finished_write(mp); 3037 return (error); 3038 } 3039 3040 /* 3041 * Set the access and modification times of a file. 3042 */ 3043 #ifndef _SYS_SYSPROTO_H_ 3044 struct utimes_args { 3045 char *path; 3046 struct timeval *tptr; 3047 }; 3048 #endif 3049 int 3050 sys_utimes(struct thread *td, struct utimes_args *uap) 3051 { 3052 3053 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3054 uap->tptr, UIO_USERSPACE)); 3055 } 3056 3057 #ifndef _SYS_SYSPROTO_H_ 3058 struct futimesat_args { 3059 int fd; 3060 const char * path; 3061 const struct timeval * times; 3062 }; 3063 #endif 3064 int 3065 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3066 { 3067 3068 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3069 uap->times, UIO_USERSPACE)); 3070 } 3071 3072 int 3073 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3074 struct timeval *tptr, enum uio_seg tptrseg) 3075 { 3076 struct nameidata nd; 3077 struct timespec ts[2]; 3078 cap_rights_t rights; 3079 int error; 3080 3081 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3082 return (error); 3083 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3084 cap_rights_init(&rights, CAP_FUTIMES), td); 3085 3086 if ((error = namei(&nd)) != 0) 3087 return (error); 3088 NDFREE(&nd, NDF_ONLY_PNBUF); 3089 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3090 vrele(nd.ni_vp); 3091 return (error); 3092 } 3093 3094 /* 3095 * Set the access and modification times of a file. 3096 */ 3097 #ifndef _SYS_SYSPROTO_H_ 3098 struct lutimes_args { 3099 char *path; 3100 struct timeval *tptr; 3101 }; 3102 #endif 3103 int 3104 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3105 { 3106 3107 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3108 UIO_USERSPACE)); 3109 } 3110 3111 int 3112 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, 3113 struct timeval *tptr, enum uio_seg tptrseg) 3114 { 3115 struct timespec ts[2]; 3116 struct nameidata nd; 3117 int error; 3118 3119 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3120 return (error); 3121 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3122 if ((error = namei(&nd)) != 0) 3123 return (error); 3124 NDFREE(&nd, NDF_ONLY_PNBUF); 3125 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3126 vrele(nd.ni_vp); 3127 return (error); 3128 } 3129 3130 /* 3131 * Set the access and modification times of a file. 3132 */ 3133 #ifndef _SYS_SYSPROTO_H_ 3134 struct futimes_args { 3135 int fd; 3136 struct timeval *tptr; 3137 }; 3138 #endif 3139 int 3140 sys_futimes(struct thread *td, struct futimes_args *uap) 3141 { 3142 3143 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3144 } 3145 3146 int 3147 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3148 enum uio_seg tptrseg) 3149 { 3150 struct timespec ts[2]; 3151 struct file *fp; 3152 cap_rights_t rights; 3153 int error; 3154 3155 AUDIT_ARG_FD(fd); 3156 error = getutimes(tptr, tptrseg, ts); 3157 if (error != 0) 3158 return (error); 3159 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FUTIMES), &fp); 3160 if (error != 0) 3161 return (error); 3162 #ifdef AUDIT 3163 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3164 AUDIT_ARG_VNODE1(fp->f_vnode); 3165 VOP_UNLOCK(fp->f_vnode, 0); 3166 #endif 3167 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3168 fdrop(fp, td); 3169 return (error); 3170 } 3171 3172 int 3173 sys_futimens(struct thread *td, struct futimens_args *uap) 3174 { 3175 3176 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3177 } 3178 3179 int 3180 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3181 enum uio_seg tptrseg) 3182 { 3183 struct timespec ts[2]; 3184 struct file *fp; 3185 cap_rights_t rights; 3186 int error, flags; 3187 3188 AUDIT_ARG_FD(fd); 3189 error = getutimens(tptr, tptrseg, ts, &flags); 3190 if (error != 0) 3191 return (error); 3192 if (flags & UTIMENS_EXIT) 3193 return (0); 3194 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FUTIMES), &fp); 3195 if (error != 0) 3196 return (error); 3197 #ifdef AUDIT 3198 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3199 AUDIT_ARG_VNODE1(fp->f_vnode); 3200 VOP_UNLOCK(fp->f_vnode, 0); 3201 #endif 3202 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3203 fdrop(fp, td); 3204 return (error); 3205 } 3206 3207 int 3208 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3209 { 3210 3211 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3212 uap->times, UIO_USERSPACE, uap->flag)); 3213 } 3214 3215 int 3216 kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3217 struct timespec *tptr, enum uio_seg tptrseg, int flag) 3218 { 3219 struct nameidata nd; 3220 struct timespec ts[2]; 3221 cap_rights_t rights; 3222 int error, flags; 3223 3224 if (flag & ~AT_SYMLINK_NOFOLLOW) 3225 return (EINVAL); 3226 3227 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3228 return (error); 3229 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 3230 FOLLOW) | AUDITVNODE1, pathseg, path, fd, 3231 cap_rights_init(&rights, CAP_FUTIMES), td); 3232 if ((error = namei(&nd)) != 0) 3233 return (error); 3234 /* 3235 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3236 * POSIX states: 3237 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3238 * "Search permission is denied by a component of the path prefix." 3239 */ 3240 NDFREE(&nd, NDF_ONLY_PNBUF); 3241 if ((flags & UTIMENS_EXIT) == 0) 3242 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3243 vrele(nd.ni_vp); 3244 return (error); 3245 } 3246 3247 /* 3248 * Truncate a file given its path name. 3249 */ 3250 #ifndef _SYS_SYSPROTO_H_ 3251 struct truncate_args { 3252 char *path; 3253 int pad; 3254 off_t length; 3255 }; 3256 #endif 3257 int 3258 sys_truncate(struct thread *td, struct truncate_args *uap) 3259 { 3260 3261 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3262 } 3263 3264 int 3265 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) 3266 { 3267 struct mount *mp; 3268 struct vnode *vp; 3269 void *rl_cookie; 3270 struct vattr vattr; 3271 struct nameidata nd; 3272 int error; 3273 3274 if (length < 0) 3275 return(EINVAL); 3276 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3277 if ((error = namei(&nd)) != 0) 3278 return (error); 3279 vp = nd.ni_vp; 3280 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3281 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3282 vn_rangelock_unlock(vp, rl_cookie); 3283 vrele(vp); 3284 return (error); 3285 } 3286 NDFREE(&nd, NDF_ONLY_PNBUF); 3287 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3288 if (vp->v_type == VDIR) 3289 error = EISDIR; 3290 #ifdef MAC 3291 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3292 } 3293 #endif 3294 else if ((error = vn_writechk(vp)) == 0 && 3295 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3296 VATTR_NULL(&vattr); 3297 vattr.va_size = length; 3298 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3299 } 3300 VOP_UNLOCK(vp, 0); 3301 vn_finished_write(mp); 3302 vn_rangelock_unlock(vp, rl_cookie); 3303 vrele(vp); 3304 return (error); 3305 } 3306 3307 #if defined(COMPAT_43) 3308 /* 3309 * Truncate a file given its path name. 3310 */ 3311 #ifndef _SYS_SYSPROTO_H_ 3312 struct otruncate_args { 3313 char *path; 3314 long length; 3315 }; 3316 #endif 3317 int 3318 otruncate(struct thread *td, struct otruncate_args *uap) 3319 { 3320 3321 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3322 } 3323 #endif /* COMPAT_43 */ 3324 3325 #if defined(COMPAT_FREEBSD6) 3326 /* Versions with the pad argument */ 3327 int 3328 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3329 { 3330 3331 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3332 } 3333 3334 int 3335 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3336 { 3337 3338 return (kern_ftruncate(td, uap->fd, uap->length)); 3339 } 3340 #endif 3341 3342 int 3343 kern_fsync(struct thread *td, int fd, bool fullsync) 3344 { 3345 struct vnode *vp; 3346 struct mount *mp; 3347 struct file *fp; 3348 cap_rights_t rights; 3349 int error, lock_flags; 3350 3351 AUDIT_ARG_FD(fd); 3352 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FSYNC), &fp); 3353 if (error != 0) 3354 return (error); 3355 vp = fp->f_vnode; 3356 #if 0 3357 if (!fullsync) 3358 /* XXXKIB: compete outstanding aio writes */; 3359 #endif 3360 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3361 if (error != 0) 3362 goto drop; 3363 if (MNT_SHARED_WRITES(mp) || 3364 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3365 lock_flags = LK_SHARED; 3366 } else { 3367 lock_flags = LK_EXCLUSIVE; 3368 } 3369 vn_lock(vp, lock_flags | LK_RETRY); 3370 AUDIT_ARG_VNODE1(vp); 3371 if (vp->v_object != NULL) { 3372 VM_OBJECT_WLOCK(vp->v_object); 3373 vm_object_page_clean(vp->v_object, 0, 0, 0); 3374 VM_OBJECT_WUNLOCK(vp->v_object); 3375 } 3376 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3377 VOP_UNLOCK(vp, 0); 3378 vn_finished_write(mp); 3379 drop: 3380 fdrop(fp, td); 3381 return (error); 3382 } 3383 3384 /* 3385 * Sync an open file. 3386 */ 3387 #ifndef _SYS_SYSPROTO_H_ 3388 struct fsync_args { 3389 int fd; 3390 }; 3391 #endif 3392 int 3393 sys_fsync(struct thread *td, struct fsync_args *uap) 3394 { 3395 3396 return (kern_fsync(td, uap->fd, true)); 3397 } 3398 3399 int 3400 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3401 { 3402 3403 return (kern_fsync(td, uap->fd, false)); 3404 } 3405 3406 /* 3407 * Rename files. Source and destination must either both be directories, or 3408 * both not be directories. If target is a directory, it must be empty. 3409 */ 3410 #ifndef _SYS_SYSPROTO_H_ 3411 struct rename_args { 3412 char *from; 3413 char *to; 3414 }; 3415 #endif 3416 int 3417 sys_rename(struct thread *td, struct rename_args *uap) 3418 { 3419 3420 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3421 uap->to, UIO_USERSPACE)); 3422 } 3423 3424 #ifndef _SYS_SYSPROTO_H_ 3425 struct renameat_args { 3426 int oldfd; 3427 char *old; 3428 int newfd; 3429 char *new; 3430 }; 3431 #endif 3432 int 3433 sys_renameat(struct thread *td, struct renameat_args *uap) 3434 { 3435 3436 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3437 UIO_USERSPACE)); 3438 } 3439 3440 int 3441 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new, 3442 enum uio_seg pathseg) 3443 { 3444 struct mount *mp = NULL; 3445 struct vnode *tvp, *fvp, *tdvp; 3446 struct nameidata fromnd, tond; 3447 cap_rights_t rights; 3448 int error; 3449 3450 again: 3451 bwillwrite(); 3452 #ifdef MAC 3453 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3454 AUDITVNODE1, pathseg, old, oldfd, 3455 cap_rights_init(&rights, CAP_RENAMEAT_SOURCE), td); 3456 #else 3457 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3458 pathseg, old, oldfd, 3459 cap_rights_init(&rights, CAP_RENAMEAT_SOURCE), td); 3460 #endif 3461 3462 if ((error = namei(&fromnd)) != 0) 3463 return (error); 3464 #ifdef MAC 3465 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3466 fromnd.ni_vp, &fromnd.ni_cnd); 3467 VOP_UNLOCK(fromnd.ni_dvp, 0); 3468 if (fromnd.ni_dvp != fromnd.ni_vp) 3469 VOP_UNLOCK(fromnd.ni_vp, 0); 3470 #endif 3471 fvp = fromnd.ni_vp; 3472 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3473 SAVESTART | AUDITVNODE2, pathseg, new, newfd, 3474 cap_rights_init(&rights, CAP_RENAMEAT_TARGET), td); 3475 if (fromnd.ni_vp->v_type == VDIR) 3476 tond.ni_cnd.cn_flags |= WILLBEDIR; 3477 if ((error = namei(&tond)) != 0) { 3478 /* Translate error code for rename("dir1", "dir2/."). */ 3479 if (error == EISDIR && fvp->v_type == VDIR) 3480 error = EINVAL; 3481 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3482 vrele(fromnd.ni_dvp); 3483 vrele(fvp); 3484 goto out1; 3485 } 3486 tdvp = tond.ni_dvp; 3487 tvp = tond.ni_vp; 3488 error = vn_start_write(fvp, &mp, V_NOWAIT); 3489 if (error != 0) { 3490 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3491 NDFREE(&tond, NDF_ONLY_PNBUF); 3492 if (tvp != NULL) 3493 vput(tvp); 3494 if (tdvp == tvp) 3495 vrele(tdvp); 3496 else 3497 vput(tdvp); 3498 vrele(fromnd.ni_dvp); 3499 vrele(fvp); 3500 vrele(tond.ni_startdir); 3501 if (fromnd.ni_startdir != NULL) 3502 vrele(fromnd.ni_startdir); 3503 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3504 if (error != 0) 3505 return (error); 3506 goto again; 3507 } 3508 if (tvp != NULL) { 3509 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3510 error = ENOTDIR; 3511 goto out; 3512 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3513 error = EISDIR; 3514 goto out; 3515 } 3516 #ifdef CAPABILITIES 3517 if (newfd != AT_FDCWD) { 3518 /* 3519 * If the target already exists we require CAP_UNLINKAT 3520 * from 'newfd'. 3521 */ 3522 error = cap_check(&tond.ni_filecaps.fc_rights, 3523 cap_rights_init(&rights, CAP_UNLINKAT)); 3524 if (error != 0) 3525 goto out; 3526 } 3527 #endif 3528 } 3529 if (fvp == tdvp) { 3530 error = EINVAL; 3531 goto out; 3532 } 3533 /* 3534 * If the source is the same as the destination (that is, if they 3535 * are links to the same vnode), then there is nothing to do. 3536 */ 3537 if (fvp == tvp) 3538 error = -1; 3539 #ifdef MAC 3540 else 3541 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3542 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3543 #endif 3544 out: 3545 if (error == 0) { 3546 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3547 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3548 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3549 NDFREE(&tond, NDF_ONLY_PNBUF); 3550 } else { 3551 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3552 NDFREE(&tond, NDF_ONLY_PNBUF); 3553 if (tvp != NULL) 3554 vput(tvp); 3555 if (tdvp == tvp) 3556 vrele(tdvp); 3557 else 3558 vput(tdvp); 3559 vrele(fromnd.ni_dvp); 3560 vrele(fvp); 3561 } 3562 vrele(tond.ni_startdir); 3563 vn_finished_write(mp); 3564 out1: 3565 if (fromnd.ni_startdir) 3566 vrele(fromnd.ni_startdir); 3567 if (error == -1) 3568 return (0); 3569 return (error); 3570 } 3571 3572 /* 3573 * Make a directory file. 3574 */ 3575 #ifndef _SYS_SYSPROTO_H_ 3576 struct mkdir_args { 3577 char *path; 3578 int mode; 3579 }; 3580 #endif 3581 int 3582 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3583 { 3584 3585 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3586 uap->mode)); 3587 } 3588 3589 #ifndef _SYS_SYSPROTO_H_ 3590 struct mkdirat_args { 3591 int fd; 3592 char *path; 3593 mode_t mode; 3594 }; 3595 #endif 3596 int 3597 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3598 { 3599 3600 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3601 } 3602 3603 int 3604 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg, 3605 int mode) 3606 { 3607 struct mount *mp; 3608 struct vnode *vp; 3609 struct vattr vattr; 3610 struct nameidata nd; 3611 cap_rights_t rights; 3612 int error; 3613 3614 AUDIT_ARG_MODE(mode); 3615 restart: 3616 bwillwrite(); 3617 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3618 NOCACHE, segflg, path, fd, cap_rights_init(&rights, CAP_MKDIRAT), 3619 td); 3620 nd.ni_cnd.cn_flags |= WILLBEDIR; 3621 if ((error = namei(&nd)) != 0) 3622 return (error); 3623 vp = nd.ni_vp; 3624 if (vp != NULL) { 3625 NDFREE(&nd, NDF_ONLY_PNBUF); 3626 /* 3627 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3628 * the strange behaviour of leaving the vnode unlocked 3629 * if the target is the same vnode as the parent. 3630 */ 3631 if (vp == nd.ni_dvp) 3632 vrele(nd.ni_dvp); 3633 else 3634 vput(nd.ni_dvp); 3635 vrele(vp); 3636 return (EEXIST); 3637 } 3638 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3639 NDFREE(&nd, NDF_ONLY_PNBUF); 3640 vput(nd.ni_dvp); 3641 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3642 return (error); 3643 goto restart; 3644 } 3645 VATTR_NULL(&vattr); 3646 vattr.va_type = VDIR; 3647 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3648 #ifdef MAC 3649 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3650 &vattr); 3651 if (error != 0) 3652 goto out; 3653 #endif 3654 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3655 #ifdef MAC 3656 out: 3657 #endif 3658 NDFREE(&nd, NDF_ONLY_PNBUF); 3659 vput(nd.ni_dvp); 3660 if (error == 0) 3661 vput(nd.ni_vp); 3662 vn_finished_write(mp); 3663 return (error); 3664 } 3665 3666 /* 3667 * Remove a directory file. 3668 */ 3669 #ifndef _SYS_SYSPROTO_H_ 3670 struct rmdir_args { 3671 char *path; 3672 }; 3673 #endif 3674 int 3675 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3676 { 3677 3678 return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE)); 3679 } 3680 3681 int 3682 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg) 3683 { 3684 struct mount *mp; 3685 struct vnode *vp; 3686 struct nameidata nd; 3687 cap_rights_t rights; 3688 int error; 3689 3690 restart: 3691 bwillwrite(); 3692 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, 3693 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td); 3694 if ((error = namei(&nd)) != 0) 3695 return (error); 3696 vp = nd.ni_vp; 3697 if (vp->v_type != VDIR) { 3698 error = ENOTDIR; 3699 goto out; 3700 } 3701 /* 3702 * No rmdir "." please. 3703 */ 3704 if (nd.ni_dvp == vp) { 3705 error = EINVAL; 3706 goto out; 3707 } 3708 /* 3709 * The root of a mounted filesystem cannot be deleted. 3710 */ 3711 if (vp->v_vflag & VV_ROOT) { 3712 error = EBUSY; 3713 goto out; 3714 } 3715 #ifdef MAC 3716 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3717 &nd.ni_cnd); 3718 if (error != 0) 3719 goto out; 3720 #endif 3721 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3722 NDFREE(&nd, NDF_ONLY_PNBUF); 3723 vput(vp); 3724 if (nd.ni_dvp == vp) 3725 vrele(nd.ni_dvp); 3726 else 3727 vput(nd.ni_dvp); 3728 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3729 return (error); 3730 goto restart; 3731 } 3732 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3733 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3734 vn_finished_write(mp); 3735 out: 3736 NDFREE(&nd, NDF_ONLY_PNBUF); 3737 vput(vp); 3738 if (nd.ni_dvp == vp) 3739 vrele(nd.ni_dvp); 3740 else 3741 vput(nd.ni_dvp); 3742 return (error); 3743 } 3744 3745 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3746 int 3747 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3748 long *basep, void (*func)(struct freebsd11_dirent *)) 3749 { 3750 struct freebsd11_dirent dstdp; 3751 struct dirent *dp, *edp; 3752 char *dirbuf; 3753 off_t base; 3754 ssize_t resid, ucount; 3755 int error; 3756 3757 /* XXX arbitrary sanity limit on `count'. */ 3758 count = min(count, 64 * 1024); 3759 3760 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3761 3762 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3763 UIO_SYSSPACE); 3764 if (error != 0) 3765 goto done; 3766 if (basep != NULL) 3767 *basep = base; 3768 3769 ucount = 0; 3770 for (dp = (struct dirent *)dirbuf, 3771 edp = (struct dirent *)&dirbuf[count - resid]; 3772 ucount < count && dp < edp; ) { 3773 if (dp->d_reclen == 0) 3774 break; 3775 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3776 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3777 continue; 3778 dstdp.d_type = dp->d_type; 3779 dstdp.d_namlen = dp->d_namlen; 3780 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3781 if (dstdp.d_fileno != dp->d_fileno) { 3782 switch (ino64_trunc_error) { 3783 default: 3784 case 0: 3785 break; 3786 case 1: 3787 error = EOVERFLOW; 3788 goto done; 3789 case 2: 3790 dstdp.d_fileno = UINT32_MAX; 3791 break; 3792 } 3793 } 3794 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3795 ((dp->d_namlen + 1 + 3) &~ 3); 3796 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3797 bzero(dstdp.d_name + dstdp.d_namlen, 3798 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3799 dstdp.d_namlen); 3800 MPASS(dstdp.d_reclen <= dp->d_reclen); 3801 MPASS(ucount + dstdp.d_reclen <= count); 3802 if (func != NULL) 3803 func(&dstdp); 3804 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3805 if (error != 0) 3806 break; 3807 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3808 ucount += dstdp.d_reclen; 3809 } 3810 3811 done: 3812 free(dirbuf, M_TEMP); 3813 if (error == 0) 3814 td->td_retval[0] = ucount; 3815 return (error); 3816 } 3817 #endif /* COMPAT */ 3818 3819 #ifdef COMPAT_43 3820 static void 3821 ogetdirentries_cvt(struct freebsd11_dirent *dp) 3822 { 3823 #if (BYTE_ORDER == LITTLE_ENDIAN) 3824 /* 3825 * The expected low byte of dp->d_namlen is our dp->d_type. 3826 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 3827 */ 3828 dp->d_type = dp->d_namlen; 3829 dp->d_namlen = 0; 3830 #else 3831 /* 3832 * The dp->d_type is the high byte of the expected dp->d_namlen, 3833 * so must be zero'ed. 3834 */ 3835 dp->d_type = 0; 3836 #endif 3837 } 3838 3839 /* 3840 * Read a block of directory entries in a filesystem independent format. 3841 */ 3842 #ifndef _SYS_SYSPROTO_H_ 3843 struct ogetdirentries_args { 3844 int fd; 3845 char *buf; 3846 u_int count; 3847 long *basep; 3848 }; 3849 #endif 3850 int 3851 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3852 { 3853 long loff; 3854 int error; 3855 3856 error = kern_ogetdirentries(td, uap, &loff); 3857 if (error == 0) 3858 error = copyout(&loff, uap->basep, sizeof(long)); 3859 return (error); 3860 } 3861 3862 int 3863 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3864 long *ploff) 3865 { 3866 long base; 3867 int error; 3868 3869 /* XXX arbitrary sanity limit on `count'. */ 3870 if (uap->count > 64 * 1024) 3871 return (EINVAL); 3872 3873 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3874 &base, ogetdirentries_cvt); 3875 3876 if (error == 0 && uap->basep != NULL) 3877 error = copyout(&base, uap->basep, sizeof(long)); 3878 3879 return (error); 3880 } 3881 #endif /* COMPAT_43 */ 3882 3883 #if defined(COMPAT_FREEBSD11) 3884 #ifndef _SYS_SYSPROTO_H_ 3885 struct freebsd11_getdirentries_args { 3886 int fd; 3887 char *buf; 3888 u_int count; 3889 long *basep; 3890 }; 3891 #endif 3892 int 3893 freebsd11_getdirentries(struct thread *td, 3894 struct freebsd11_getdirentries_args *uap) 3895 { 3896 long base; 3897 int error; 3898 3899 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3900 &base, NULL); 3901 3902 if (error == 0 && uap->basep != NULL) 3903 error = copyout(&base, uap->basep, sizeof(long)); 3904 return (error); 3905 } 3906 3907 int 3908 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 3909 { 3910 struct freebsd11_getdirentries_args ap; 3911 3912 ap.fd = uap->fd; 3913 ap.buf = uap->buf; 3914 ap.count = uap->count; 3915 ap.basep = NULL; 3916 return (freebsd11_getdirentries(td, &ap)); 3917 } 3918 #endif /* COMPAT_FREEBSD11 */ 3919 3920 /* 3921 * Read a block of directory entries in a filesystem independent format. 3922 */ 3923 int 3924 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 3925 { 3926 off_t base; 3927 int error; 3928 3929 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 3930 NULL, UIO_USERSPACE); 3931 if (error != 0) 3932 return (error); 3933 if (uap->basep != NULL) 3934 error = copyout(&base, uap->basep, sizeof(off_t)); 3935 return (error); 3936 } 3937 3938 int 3939 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 3940 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 3941 { 3942 struct vnode *vp; 3943 struct file *fp; 3944 struct uio auio; 3945 struct iovec aiov; 3946 cap_rights_t rights; 3947 off_t loff; 3948 int error, eofflag; 3949 off_t foffset; 3950 3951 AUDIT_ARG_FD(fd); 3952 if (count > IOSIZE_MAX) 3953 return (EINVAL); 3954 auio.uio_resid = count; 3955 error = getvnode(td, fd, cap_rights_init(&rights, CAP_READ), &fp); 3956 if (error != 0) 3957 return (error); 3958 if ((fp->f_flag & FREAD) == 0) { 3959 fdrop(fp, td); 3960 return (EBADF); 3961 } 3962 vp = fp->f_vnode; 3963 foffset = foffset_lock(fp, 0); 3964 unionread: 3965 if (vp->v_type != VDIR) { 3966 error = EINVAL; 3967 goto fail; 3968 } 3969 aiov.iov_base = buf; 3970 aiov.iov_len = count; 3971 auio.uio_iov = &aiov; 3972 auio.uio_iovcnt = 1; 3973 auio.uio_rw = UIO_READ; 3974 auio.uio_segflg = bufseg; 3975 auio.uio_td = td; 3976 vn_lock(vp, LK_SHARED | LK_RETRY); 3977 AUDIT_ARG_VNODE1(vp); 3978 loff = auio.uio_offset = foffset; 3979 #ifdef MAC 3980 error = mac_vnode_check_readdir(td->td_ucred, vp); 3981 if (error == 0) 3982 #endif 3983 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 3984 NULL); 3985 foffset = auio.uio_offset; 3986 if (error != 0) { 3987 VOP_UNLOCK(vp, 0); 3988 goto fail; 3989 } 3990 if (count == auio.uio_resid && 3991 (vp->v_vflag & VV_ROOT) && 3992 (vp->v_mount->mnt_flag & MNT_UNION)) { 3993 struct vnode *tvp = vp; 3994 3995 vp = vp->v_mount->mnt_vnodecovered; 3996 VREF(vp); 3997 fp->f_vnode = vp; 3998 fp->f_data = vp; 3999 foffset = 0; 4000 vput(tvp); 4001 goto unionread; 4002 } 4003 VOP_UNLOCK(vp, 0); 4004 *basep = loff; 4005 if (residp != NULL) 4006 *residp = auio.uio_resid; 4007 td->td_retval[0] = count - auio.uio_resid; 4008 fail: 4009 foffset_unlock(fp, foffset, 0); 4010 fdrop(fp, td); 4011 return (error); 4012 } 4013 4014 /* 4015 * Set the mode mask for creation of filesystem nodes. 4016 */ 4017 #ifndef _SYS_SYSPROTO_H_ 4018 struct umask_args { 4019 int newmask; 4020 }; 4021 #endif 4022 int 4023 sys_umask(struct thread *td, struct umask_args *uap) 4024 { 4025 struct filedesc *fdp; 4026 4027 fdp = td->td_proc->p_fd; 4028 FILEDESC_XLOCK(fdp); 4029 td->td_retval[0] = fdp->fd_cmask; 4030 fdp->fd_cmask = uap->newmask & ALLPERMS; 4031 FILEDESC_XUNLOCK(fdp); 4032 return (0); 4033 } 4034 4035 /* 4036 * Void all references to file by ripping underlying filesystem away from 4037 * vnode. 4038 */ 4039 #ifndef _SYS_SYSPROTO_H_ 4040 struct revoke_args { 4041 char *path; 4042 }; 4043 #endif 4044 int 4045 sys_revoke(struct thread *td, struct revoke_args *uap) 4046 { 4047 struct vnode *vp; 4048 struct vattr vattr; 4049 struct nameidata nd; 4050 int error; 4051 4052 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4053 uap->path, td); 4054 if ((error = namei(&nd)) != 0) 4055 return (error); 4056 vp = nd.ni_vp; 4057 NDFREE(&nd, NDF_ONLY_PNBUF); 4058 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4059 error = EINVAL; 4060 goto out; 4061 } 4062 #ifdef MAC 4063 error = mac_vnode_check_revoke(td->td_ucred, vp); 4064 if (error != 0) 4065 goto out; 4066 #endif 4067 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4068 if (error != 0) 4069 goto out; 4070 if (td->td_ucred->cr_uid != vattr.va_uid) { 4071 error = priv_check(td, PRIV_VFS_ADMIN); 4072 if (error != 0) 4073 goto out; 4074 } 4075 if (vcount(vp) > 1) 4076 VOP_REVOKE(vp, REVOKEALL); 4077 out: 4078 vput(vp); 4079 return (error); 4080 } 4081 4082 /* 4083 * Convert a user file descriptor to a kernel file entry and check that, if it 4084 * is a capability, the correct rights are present. A reference on the file 4085 * entry is held upon returning. 4086 */ 4087 int 4088 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4089 { 4090 struct file *fp; 4091 int error; 4092 4093 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); 4094 if (error != 0) 4095 return (error); 4096 4097 /* 4098 * The file could be not of the vnode type, or it may be not 4099 * yet fully initialized, in which case the f_vnode pointer 4100 * may be set, but f_ops is still badfileops. E.g., 4101 * devfs_open() transiently create such situation to 4102 * facilitate csw d_fdopen(). 4103 * 4104 * Dupfdopen() handling in kern_openat() installs the 4105 * half-baked file into the process descriptor table, allowing 4106 * other thread to dereference it. Guard against the race by 4107 * checking f_ops. 4108 */ 4109 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4110 fdrop(fp, td); 4111 return (EINVAL); 4112 } 4113 *fpp = fp; 4114 return (0); 4115 } 4116 4117 4118 /* 4119 * Get an (NFS) file handle. 4120 */ 4121 #ifndef _SYS_SYSPROTO_H_ 4122 struct lgetfh_args { 4123 char *fname; 4124 fhandle_t *fhp; 4125 }; 4126 #endif 4127 int 4128 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4129 { 4130 struct nameidata nd; 4131 fhandle_t fh; 4132 struct vnode *vp; 4133 int error; 4134 4135 error = priv_check(td, PRIV_VFS_GETFH); 4136 if (error != 0) 4137 return (error); 4138 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4139 uap->fname, td); 4140 error = namei(&nd); 4141 if (error != 0) 4142 return (error); 4143 NDFREE(&nd, NDF_ONLY_PNBUF); 4144 vp = nd.ni_vp; 4145 bzero(&fh, sizeof(fh)); 4146 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4147 error = VOP_VPTOFH(vp, &fh.fh_fid); 4148 vput(vp); 4149 if (error == 0) 4150 error = copyout(&fh, uap->fhp, sizeof (fh)); 4151 return (error); 4152 } 4153 4154 #ifndef _SYS_SYSPROTO_H_ 4155 struct getfh_args { 4156 char *fname; 4157 fhandle_t *fhp; 4158 }; 4159 #endif 4160 int 4161 sys_getfh(struct thread *td, struct getfh_args *uap) 4162 { 4163 struct nameidata nd; 4164 fhandle_t fh; 4165 struct vnode *vp; 4166 int error; 4167 4168 error = priv_check(td, PRIV_VFS_GETFH); 4169 if (error != 0) 4170 return (error); 4171 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4172 uap->fname, td); 4173 error = namei(&nd); 4174 if (error != 0) 4175 return (error); 4176 NDFREE(&nd, NDF_ONLY_PNBUF); 4177 vp = nd.ni_vp; 4178 bzero(&fh, sizeof(fh)); 4179 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4180 error = VOP_VPTOFH(vp, &fh.fh_fid); 4181 vput(vp); 4182 if (error == 0) 4183 error = copyout(&fh, uap->fhp, sizeof (fh)); 4184 return (error); 4185 } 4186 4187 /* 4188 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4189 * open descriptor. 4190 * 4191 * warning: do not remove the priv_check() call or this becomes one giant 4192 * security hole. 4193 */ 4194 #ifndef _SYS_SYSPROTO_H_ 4195 struct fhopen_args { 4196 const struct fhandle *u_fhp; 4197 int flags; 4198 }; 4199 #endif 4200 int 4201 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4202 { 4203 struct mount *mp; 4204 struct vnode *vp; 4205 struct fhandle fhp; 4206 struct file *fp; 4207 int fmode, error; 4208 int indx; 4209 4210 error = priv_check(td, PRIV_VFS_FHOPEN); 4211 if (error != 0) 4212 return (error); 4213 indx = -1; 4214 fmode = FFLAGS(uap->flags); 4215 /* why not allow a non-read/write open for our lockd? */ 4216 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4217 return (EINVAL); 4218 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4219 if (error != 0) 4220 return(error); 4221 /* find the mount point */ 4222 mp = vfs_busyfs(&fhp.fh_fsid); 4223 if (mp == NULL) 4224 return (ESTALE); 4225 /* now give me my vnode, it gets returned to me locked */ 4226 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4227 vfs_unbusy(mp); 4228 if (error != 0) 4229 return (error); 4230 4231 error = falloc_noinstall(td, &fp); 4232 if (error != 0) { 4233 vput(vp); 4234 return (error); 4235 } 4236 /* 4237 * An extra reference on `fp' has been held for us by 4238 * falloc_noinstall(). 4239 */ 4240 4241 #ifdef INVARIANTS 4242 td->td_dupfd = -1; 4243 #endif 4244 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4245 if (error != 0) { 4246 KASSERT(fp->f_ops == &badfileops, 4247 ("VOP_OPEN in fhopen() set f_ops")); 4248 KASSERT(td->td_dupfd < 0, 4249 ("fhopen() encountered fdopen()")); 4250 4251 vput(vp); 4252 goto bad; 4253 } 4254 #ifdef INVARIANTS 4255 td->td_dupfd = 0; 4256 #endif 4257 fp->f_vnode = vp; 4258 fp->f_seqcount = 1; 4259 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp, 4260 &vnops); 4261 VOP_UNLOCK(vp, 0); 4262 if ((fmode & O_TRUNC) != 0) { 4263 error = fo_truncate(fp, 0, td->td_ucred, td); 4264 if (error != 0) 4265 goto bad; 4266 } 4267 4268 error = finstall(td, fp, &indx, fmode, NULL); 4269 bad: 4270 fdrop(fp, td); 4271 td->td_retval[0] = indx; 4272 return (error); 4273 } 4274 4275 /* 4276 * Stat an (NFS) file handle. 4277 */ 4278 #ifndef _SYS_SYSPROTO_H_ 4279 struct fhstat_args { 4280 struct fhandle *u_fhp; 4281 struct stat *sb; 4282 }; 4283 #endif 4284 int 4285 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4286 { 4287 struct stat sb; 4288 struct fhandle fh; 4289 int error; 4290 4291 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4292 if (error != 0) 4293 return (error); 4294 error = kern_fhstat(td, fh, &sb); 4295 if (error == 0) 4296 error = copyout(&sb, uap->sb, sizeof(sb)); 4297 return (error); 4298 } 4299 4300 int 4301 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4302 { 4303 struct mount *mp; 4304 struct vnode *vp; 4305 int error; 4306 4307 error = priv_check(td, PRIV_VFS_FHSTAT); 4308 if (error != 0) 4309 return (error); 4310 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4311 return (ESTALE); 4312 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4313 vfs_unbusy(mp); 4314 if (error != 0) 4315 return (error); 4316 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td); 4317 vput(vp); 4318 return (error); 4319 } 4320 4321 /* 4322 * Implement fstatfs() for (NFS) file handles. 4323 */ 4324 #ifndef _SYS_SYSPROTO_H_ 4325 struct fhstatfs_args { 4326 struct fhandle *u_fhp; 4327 struct statfs *buf; 4328 }; 4329 #endif 4330 int 4331 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4332 { 4333 struct statfs *sfp; 4334 fhandle_t fh; 4335 int error; 4336 4337 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4338 if (error != 0) 4339 return (error); 4340 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4341 error = kern_fhstatfs(td, fh, sfp); 4342 if (error == 0) 4343 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4344 free(sfp, M_STATFS); 4345 return (error); 4346 } 4347 4348 int 4349 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4350 { 4351 struct statfs *sp; 4352 struct mount *mp; 4353 struct vnode *vp; 4354 int error; 4355 4356 error = priv_check(td, PRIV_VFS_FHSTATFS); 4357 if (error != 0) 4358 return (error); 4359 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4360 return (ESTALE); 4361 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4362 if (error != 0) { 4363 vfs_unbusy(mp); 4364 return (error); 4365 } 4366 vput(vp); 4367 error = prison_canseemount(td->td_ucred, mp); 4368 if (error != 0) 4369 goto out; 4370 #ifdef MAC 4371 error = mac_mount_check_stat(td->td_ucred, mp); 4372 if (error != 0) 4373 goto out; 4374 #endif 4375 /* 4376 * Set these in case the underlying filesystem fails to do so. 4377 */ 4378 sp = &mp->mnt_stat; 4379 sp->f_version = STATFS_VERSION; 4380 sp->f_namemax = NAME_MAX; 4381 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 4382 error = VFS_STATFS(mp, sp); 4383 if (error == 0) 4384 *buf = *sp; 4385 out: 4386 vfs_unbusy(mp); 4387 return (error); 4388 } 4389 4390 int 4391 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len) 4392 { 4393 struct file *fp; 4394 struct mount *mp; 4395 struct vnode *vp; 4396 cap_rights_t rights; 4397 off_t olen, ooffset; 4398 int error; 4399 #ifdef AUDIT 4400 int audited_vnode1 = 0; 4401 #endif 4402 4403 AUDIT_ARG_FD(fd); 4404 if (offset < 0 || len <= 0) 4405 return (EINVAL); 4406 /* Check for wrap. */ 4407 if (offset > OFF_MAX - len) 4408 return (EFBIG); 4409 AUDIT_ARG_FD(fd); 4410 error = fget(td, fd, cap_rights_init(&rights, CAP_PWRITE), &fp); 4411 if (error != 0) 4412 return (error); 4413 AUDIT_ARG_FILE(td->td_proc, fp); 4414 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4415 error = ESPIPE; 4416 goto out; 4417 } 4418 if ((fp->f_flag & FWRITE) == 0) { 4419 error = EBADF; 4420 goto out; 4421 } 4422 if (fp->f_type != DTYPE_VNODE) { 4423 error = ENODEV; 4424 goto out; 4425 } 4426 vp = fp->f_vnode; 4427 if (vp->v_type != VREG) { 4428 error = ENODEV; 4429 goto out; 4430 } 4431 4432 /* Allocating blocks may take a long time, so iterate. */ 4433 for (;;) { 4434 olen = len; 4435 ooffset = offset; 4436 4437 bwillwrite(); 4438 mp = NULL; 4439 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 4440 if (error != 0) 4441 break; 4442 error = vn_lock(vp, LK_EXCLUSIVE); 4443 if (error != 0) { 4444 vn_finished_write(mp); 4445 break; 4446 } 4447 #ifdef AUDIT 4448 if (!audited_vnode1) { 4449 AUDIT_ARG_VNODE1(vp); 4450 audited_vnode1 = 1; 4451 } 4452 #endif 4453 #ifdef MAC 4454 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp); 4455 if (error == 0) 4456 #endif 4457 error = VOP_ALLOCATE(vp, &offset, &len); 4458 VOP_UNLOCK(vp, 0); 4459 vn_finished_write(mp); 4460 4461 if (olen + ooffset != offset + len) { 4462 panic("offset + len changed from %jx/%jx to %jx/%jx", 4463 ooffset, olen, offset, len); 4464 } 4465 if (error != 0 || len == 0) 4466 break; 4467 KASSERT(olen > len, ("Iteration did not make progress?")); 4468 maybe_yield(); 4469 } 4470 out: 4471 fdrop(fp, td); 4472 return (error); 4473 } 4474 4475 int 4476 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap) 4477 { 4478 int error; 4479 4480 error = kern_posix_fallocate(td, uap->fd, uap->offset, uap->len); 4481 return (kern_posix_error(td, error)); 4482 } 4483 4484 /* 4485 * Unlike madvise(2), we do not make a best effort to remember every 4486 * possible caching hint. Instead, we remember the last setting with 4487 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4488 * region of any current setting. 4489 */ 4490 int 4491 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4492 int advice) 4493 { 4494 struct fadvise_info *fa, *new; 4495 struct file *fp; 4496 struct vnode *vp; 4497 cap_rights_t rights; 4498 off_t end; 4499 int error; 4500 4501 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4502 return (EINVAL); 4503 AUDIT_ARG_VALUE(advice); 4504 switch (advice) { 4505 case POSIX_FADV_SEQUENTIAL: 4506 case POSIX_FADV_RANDOM: 4507 case POSIX_FADV_NOREUSE: 4508 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4509 break; 4510 case POSIX_FADV_NORMAL: 4511 case POSIX_FADV_WILLNEED: 4512 case POSIX_FADV_DONTNEED: 4513 new = NULL; 4514 break; 4515 default: 4516 return (EINVAL); 4517 } 4518 /* XXX: CAP_POSIX_FADVISE? */ 4519 AUDIT_ARG_FD(fd); 4520 error = fget(td, fd, cap_rights_init(&rights), &fp); 4521 if (error != 0) 4522 goto out; 4523 AUDIT_ARG_FILE(td->td_proc, fp); 4524 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4525 error = ESPIPE; 4526 goto out; 4527 } 4528 if (fp->f_type != DTYPE_VNODE) { 4529 error = ENODEV; 4530 goto out; 4531 } 4532 vp = fp->f_vnode; 4533 if (vp->v_type != VREG) { 4534 error = ENODEV; 4535 goto out; 4536 } 4537 if (len == 0) 4538 end = OFF_MAX; 4539 else 4540 end = offset + len - 1; 4541 switch (advice) { 4542 case POSIX_FADV_SEQUENTIAL: 4543 case POSIX_FADV_RANDOM: 4544 case POSIX_FADV_NOREUSE: 4545 /* 4546 * Try to merge any existing non-standard region with 4547 * this new region if possible, otherwise create a new 4548 * non-standard region for this request. 4549 */ 4550 mtx_pool_lock(mtxpool_sleep, fp); 4551 fa = fp->f_advice; 4552 if (fa != NULL && fa->fa_advice == advice && 4553 ((fa->fa_start <= end && fa->fa_end >= offset) || 4554 (end != OFF_MAX && fa->fa_start == end + 1) || 4555 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4556 if (offset < fa->fa_start) 4557 fa->fa_start = offset; 4558 if (end > fa->fa_end) 4559 fa->fa_end = end; 4560 } else { 4561 new->fa_advice = advice; 4562 new->fa_start = offset; 4563 new->fa_end = end; 4564 fp->f_advice = new; 4565 new = fa; 4566 } 4567 mtx_pool_unlock(mtxpool_sleep, fp); 4568 break; 4569 case POSIX_FADV_NORMAL: 4570 /* 4571 * If a the "normal" region overlaps with an existing 4572 * non-standard region, trim or remove the 4573 * non-standard region. 4574 */ 4575 mtx_pool_lock(mtxpool_sleep, fp); 4576 fa = fp->f_advice; 4577 if (fa != NULL) { 4578 if (offset <= fa->fa_start && end >= fa->fa_end) { 4579 new = fa; 4580 fp->f_advice = NULL; 4581 } else if (offset <= fa->fa_start && 4582 end >= fa->fa_start) 4583 fa->fa_start = end + 1; 4584 else if (offset <= fa->fa_end && end >= fa->fa_end) 4585 fa->fa_end = offset - 1; 4586 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4587 /* 4588 * If the "normal" region is a middle 4589 * portion of the existing 4590 * non-standard region, just remove 4591 * the whole thing rather than picking 4592 * one side or the other to 4593 * preserve. 4594 */ 4595 new = fa; 4596 fp->f_advice = NULL; 4597 } 4598 } 4599 mtx_pool_unlock(mtxpool_sleep, fp); 4600 break; 4601 case POSIX_FADV_WILLNEED: 4602 case POSIX_FADV_DONTNEED: 4603 error = VOP_ADVISE(vp, offset, end, advice); 4604 break; 4605 } 4606 out: 4607 if (fp != NULL) 4608 fdrop(fp, td); 4609 free(new, M_FADVISE); 4610 return (error); 4611 } 4612 4613 int 4614 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4615 { 4616 int error; 4617 4618 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4619 uap->advice); 4620 return (kern_posix_error(td, error)); 4621 } 4622