1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "opt_capsicum.h" 41 #include "opt_compat.h" 42 #include "opt_ktrace.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/bio.h> 47 #include <sys/buf.h> 48 #include <sys/capsicum.h> 49 #include <sys/disk.h> 50 #include <sys/sysent.h> 51 #include <sys/malloc.h> 52 #include <sys/mount.h> 53 #include <sys/mutex.h> 54 #include <sys/sysproto.h> 55 #include <sys/namei.h> 56 #include <sys/filedesc.h> 57 #include <sys/kernel.h> 58 #include <sys/fcntl.h> 59 #include <sys/file.h> 60 #include <sys/filio.h> 61 #include <sys/limits.h> 62 #include <sys/linker.h> 63 #include <sys/rwlock.h> 64 #include <sys/sdt.h> 65 #include <sys/stat.h> 66 #include <sys/sx.h> 67 #include <sys/unistd.h> 68 #include <sys/vnode.h> 69 #include <sys/priv.h> 70 #include <sys/proc.h> 71 #include <sys/dirent.h> 72 #include <sys/jail.h> 73 #include <sys/syscallsubr.h> 74 #include <sys/sysctl.h> 75 #ifdef KTRACE 76 #include <sys/ktrace.h> 77 #endif 78 79 #include <machine/stdarg.h> 80 81 #include <security/audit/audit.h> 82 #include <security/mac/mac_framework.h> 83 84 #include <vm/vm.h> 85 #include <vm/vm_object.h> 86 #include <vm/vm_page.h> 87 #include <vm/uma.h> 88 89 #include <ufs/ufs/quota.h> 90 91 MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); 92 93 SDT_PROVIDER_DEFINE(vfs); 94 SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int"); 95 SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int"); 96 97 static int kern_chflagsat(struct thread *td, int fd, const char *path, 98 enum uio_seg pathseg, u_long flags, int atflag); 99 static int setfflags(struct thread *td, struct vnode *, u_long); 100 static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); 101 static int getutimens(const struct timespec *, enum uio_seg, 102 struct timespec *, int *); 103 static int setutimes(struct thread *td, struct vnode *, 104 const struct timespec *, int, int); 105 static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 106 struct thread *td); 107 108 /* 109 * Sync each mounted filesystem. 110 */ 111 #ifndef _SYS_SYSPROTO_H_ 112 struct sync_args { 113 int dummy; 114 }; 115 #endif 116 /* ARGSUSED */ 117 int 118 sys_sync(struct thread *td, struct sync_args *uap) 119 { 120 struct mount *mp, *nmp; 121 int save; 122 123 mtx_lock(&mountlist_mtx); 124 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 125 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 126 nmp = TAILQ_NEXT(mp, mnt_list); 127 continue; 128 } 129 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 130 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 131 save = curthread_pflags_set(TDP_SYNCIO); 132 vfs_msync(mp, MNT_NOWAIT); 133 VFS_SYNC(mp, MNT_NOWAIT); 134 curthread_pflags_restore(save); 135 vn_finished_write(mp); 136 } 137 mtx_lock(&mountlist_mtx); 138 nmp = TAILQ_NEXT(mp, mnt_list); 139 vfs_unbusy(mp); 140 } 141 mtx_unlock(&mountlist_mtx); 142 return (0); 143 } 144 145 /* 146 * Change filesystem quotas. 147 */ 148 #ifndef _SYS_SYSPROTO_H_ 149 struct quotactl_args { 150 char *path; 151 int cmd; 152 int uid; 153 caddr_t arg; 154 }; 155 #endif 156 int 157 sys_quotactl(struct thread *td, struct quotactl_args *uap) 158 { 159 struct mount *mp; 160 struct nameidata nd; 161 int error; 162 163 AUDIT_ARG_CMD(uap->cmd); 164 AUDIT_ARG_UID(uap->uid); 165 if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) 166 return (EPERM); 167 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 168 uap->path, td); 169 if ((error = namei(&nd)) != 0) 170 return (error); 171 NDFREE(&nd, NDF_ONLY_PNBUF); 172 mp = nd.ni_vp->v_mount; 173 vfs_ref(mp); 174 vput(nd.ni_vp); 175 error = vfs_busy(mp, 0); 176 vfs_rel(mp); 177 if (error != 0) 178 return (error); 179 error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); 180 181 /* 182 * Since quota on operation typically needs to open quota 183 * file, the Q_QUOTAON handler needs to unbusy the mount point 184 * before calling into namei. Otherwise, unmount might be 185 * started between two vfs_busy() invocations (first is our, 186 * second is from mount point cross-walk code in lookup()), 187 * causing deadlock. 188 * 189 * Require that Q_QUOTAON handles the vfs_busy() reference on 190 * its own, always returning with ubusied mount point. 191 */ 192 if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON) 193 vfs_unbusy(mp); 194 return (error); 195 } 196 197 /* 198 * Used by statfs conversion routines to scale the block size up if 199 * necessary so that all of the block counts are <= 'max_size'. Note 200 * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero 201 * value of 'n'. 202 */ 203 void 204 statfs_scale_blocks(struct statfs *sf, long max_size) 205 { 206 uint64_t count; 207 int shift; 208 209 KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); 210 211 /* 212 * Attempt to scale the block counts to give a more accurate 213 * overview to userland of the ratio of free space to used 214 * space. To do this, find the largest block count and compute 215 * a divisor that lets it fit into a signed integer <= max_size. 216 */ 217 if (sf->f_bavail < 0) 218 count = -sf->f_bavail; 219 else 220 count = sf->f_bavail; 221 count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); 222 if (count <= max_size) 223 return; 224 225 count >>= flsl(max_size); 226 shift = 0; 227 while (count > 0) { 228 shift++; 229 count >>=1; 230 } 231 232 sf->f_bsize <<= shift; 233 sf->f_blocks >>= shift; 234 sf->f_bfree >>= shift; 235 sf->f_bavail >>= shift; 236 } 237 238 static int 239 kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) 240 { 241 struct statfs *sp; 242 int error; 243 244 if (mp == NULL) 245 return (EBADF); 246 error = vfs_busy(mp, 0); 247 vfs_rel(mp); 248 if (error != 0) 249 return (error); 250 #ifdef MAC 251 error = mac_mount_check_stat(td->td_ucred, mp); 252 if (error != 0) 253 goto out; 254 #endif 255 /* 256 * Set these in case the underlying filesystem fails to do so. 257 */ 258 sp = &mp->mnt_stat; 259 sp->f_version = STATFS_VERSION; 260 sp->f_namemax = NAME_MAX; 261 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 262 error = VFS_STATFS(mp, sp); 263 if (error != 0) 264 goto out; 265 *buf = *sp; 266 if (priv_check(td, PRIV_VFS_GENERATION)) { 267 buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; 268 prison_enforce_statfs(td->td_ucred, mp, buf); 269 } 270 out: 271 vfs_unbusy(mp); 272 return (error); 273 } 274 275 /* 276 * Get filesystem statistics. 277 */ 278 #ifndef _SYS_SYSPROTO_H_ 279 struct statfs_args { 280 char *path; 281 struct statfs *buf; 282 }; 283 #endif 284 int 285 sys_statfs(struct thread *td, struct statfs_args *uap) 286 { 287 struct statfs *sfp; 288 int error; 289 290 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 291 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 292 if (error == 0) 293 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 294 free(sfp, M_STATFS); 295 return (error); 296 } 297 298 int 299 kern_statfs(struct thread *td, char *path, enum uio_seg pathseg, 300 struct statfs *buf) 301 { 302 struct mount *mp; 303 struct nameidata nd; 304 int error; 305 306 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 307 pathseg, path, td); 308 error = namei(&nd); 309 if (error != 0) 310 return (error); 311 mp = nd.ni_vp->v_mount; 312 vfs_ref(mp); 313 NDFREE(&nd, NDF_ONLY_PNBUF); 314 vput(nd.ni_vp); 315 return (kern_do_statfs(td, mp, buf)); 316 } 317 318 /* 319 * Get filesystem statistics. 320 */ 321 #ifndef _SYS_SYSPROTO_H_ 322 struct fstatfs_args { 323 int fd; 324 struct statfs *buf; 325 }; 326 #endif 327 int 328 sys_fstatfs(struct thread *td, struct fstatfs_args *uap) 329 { 330 struct statfs *sfp; 331 int error; 332 333 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 334 error = kern_fstatfs(td, uap->fd, sfp); 335 if (error == 0) 336 error = copyout(sfp, uap->buf, sizeof(struct statfs)); 337 free(sfp, M_STATFS); 338 return (error); 339 } 340 341 int 342 kern_fstatfs(struct thread *td, int fd, struct statfs *buf) 343 { 344 struct file *fp; 345 struct mount *mp; 346 struct vnode *vp; 347 cap_rights_t rights; 348 int error; 349 350 AUDIT_ARG_FD(fd); 351 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FSTATFS), &fp); 352 if (error != 0) 353 return (error); 354 vp = fp->f_vnode; 355 vn_lock(vp, LK_SHARED | LK_RETRY); 356 #ifdef AUDIT 357 AUDIT_ARG_VNODE1(vp); 358 #endif 359 mp = vp->v_mount; 360 if (mp != NULL) 361 vfs_ref(mp); 362 VOP_UNLOCK(vp, 0); 363 fdrop(fp, td); 364 return (kern_do_statfs(td, mp, buf)); 365 } 366 367 /* 368 * Get statistics on all filesystems. 369 */ 370 #ifndef _SYS_SYSPROTO_H_ 371 struct getfsstat_args { 372 struct statfs *buf; 373 long bufsize; 374 int mode; 375 }; 376 #endif 377 int 378 sys_getfsstat(struct thread *td, struct getfsstat_args *uap) 379 { 380 size_t count; 381 int error; 382 383 if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) 384 return (EINVAL); 385 error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, 386 UIO_USERSPACE, uap->mode); 387 if (error == 0) 388 td->td_retval[0] = count; 389 return (error); 390 } 391 392 /* 393 * If (bufsize > 0 && bufseg == UIO_SYSSPACE) 394 * The caller is responsible for freeing memory which will be allocated 395 * in '*buf'. 396 */ 397 int 398 kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, 399 size_t *countp, enum uio_seg bufseg, int mode) 400 { 401 struct mount *mp, *nmp; 402 struct statfs *sfsp, *sp, *sptmp, *tofree; 403 size_t count, maxcount; 404 int error; 405 406 switch (mode) { 407 case MNT_WAIT: 408 case MNT_NOWAIT: 409 break; 410 default: 411 if (bufseg == UIO_SYSSPACE) 412 *buf = NULL; 413 return (EINVAL); 414 } 415 restart: 416 maxcount = bufsize / sizeof(struct statfs); 417 if (bufsize == 0) { 418 sfsp = NULL; 419 tofree = NULL; 420 } else if (bufseg == UIO_USERSPACE) { 421 sfsp = *buf; 422 tofree = NULL; 423 } else /* if (bufseg == UIO_SYSSPACE) */ { 424 count = 0; 425 mtx_lock(&mountlist_mtx); 426 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 427 count++; 428 } 429 mtx_unlock(&mountlist_mtx); 430 if (maxcount > count) 431 maxcount = count; 432 tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), 433 M_STATFS, M_WAITOK); 434 } 435 count = 0; 436 mtx_lock(&mountlist_mtx); 437 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 438 if (prison_canseemount(td->td_ucred, mp) != 0) { 439 nmp = TAILQ_NEXT(mp, mnt_list); 440 continue; 441 } 442 #ifdef MAC 443 if (mac_mount_check_stat(td->td_ucred, mp) != 0) { 444 nmp = TAILQ_NEXT(mp, mnt_list); 445 continue; 446 } 447 #endif 448 if (mode == MNT_WAIT) { 449 if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { 450 /* 451 * If vfs_busy() failed, and MBF_NOWAIT 452 * wasn't passed, then the mp is gone. 453 * Furthermore, because of MBF_MNTLSTLOCK, 454 * the mountlist_mtx was dropped. We have 455 * no other choice than to start over. 456 */ 457 mtx_unlock(&mountlist_mtx); 458 free(tofree, M_STATFS); 459 goto restart; 460 } 461 } else { 462 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { 463 nmp = TAILQ_NEXT(mp, mnt_list); 464 continue; 465 } 466 } 467 if (sfsp != NULL && count < maxcount) { 468 sp = &mp->mnt_stat; 469 /* 470 * Set these in case the underlying filesystem 471 * fails to do so. 472 */ 473 sp->f_version = STATFS_VERSION; 474 sp->f_namemax = NAME_MAX; 475 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 476 /* 477 * If MNT_NOWAIT is specified, do not refresh 478 * the fsstat cache. 479 */ 480 if (mode != MNT_NOWAIT) { 481 error = VFS_STATFS(mp, sp); 482 if (error != 0) { 483 mtx_lock(&mountlist_mtx); 484 nmp = TAILQ_NEXT(mp, mnt_list); 485 vfs_unbusy(mp); 486 continue; 487 } 488 } 489 if (priv_check(td, PRIV_VFS_GENERATION)) { 490 sptmp = malloc(sizeof(struct statfs), M_STATFS, 491 M_WAITOK); 492 *sptmp = *sp; 493 sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; 494 prison_enforce_statfs(td->td_ucred, mp, sptmp); 495 sp = sptmp; 496 } else 497 sptmp = NULL; 498 if (bufseg == UIO_SYSSPACE) { 499 bcopy(sp, sfsp, sizeof(*sp)); 500 free(sptmp, M_STATFS); 501 } else /* if (bufseg == UIO_USERSPACE) */ { 502 error = copyout(sp, sfsp, sizeof(*sp)); 503 free(sptmp, M_STATFS); 504 if (error != 0) { 505 vfs_unbusy(mp); 506 return (error); 507 } 508 } 509 sfsp++; 510 } 511 count++; 512 mtx_lock(&mountlist_mtx); 513 nmp = TAILQ_NEXT(mp, mnt_list); 514 vfs_unbusy(mp); 515 } 516 mtx_unlock(&mountlist_mtx); 517 if (sfsp != NULL && count > maxcount) 518 *countp = maxcount; 519 else 520 *countp = count; 521 return (0); 522 } 523 524 #ifdef COMPAT_FREEBSD4 525 /* 526 * Get old format filesystem statistics. 527 */ 528 static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); 529 530 #ifndef _SYS_SYSPROTO_H_ 531 struct freebsd4_statfs_args { 532 char *path; 533 struct ostatfs *buf; 534 }; 535 #endif 536 int 537 freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) 538 { 539 struct ostatfs osb; 540 struct statfs *sfp; 541 int error; 542 543 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 544 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 545 if (error == 0) { 546 freebsd4_cvtstatfs(sfp, &osb); 547 error = copyout(&osb, uap->buf, sizeof(osb)); 548 } 549 free(sfp, M_STATFS); 550 return (error); 551 } 552 553 /* 554 * Get filesystem statistics. 555 */ 556 #ifndef _SYS_SYSPROTO_H_ 557 struct freebsd4_fstatfs_args { 558 int fd; 559 struct ostatfs *buf; 560 }; 561 #endif 562 int 563 freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) 564 { 565 struct ostatfs osb; 566 struct statfs *sfp; 567 int error; 568 569 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 570 error = kern_fstatfs(td, uap->fd, sfp); 571 if (error == 0) { 572 freebsd4_cvtstatfs(sfp, &osb); 573 error = copyout(&osb, uap->buf, sizeof(osb)); 574 } 575 free(sfp, M_STATFS); 576 return (error); 577 } 578 579 /* 580 * Get statistics on all filesystems. 581 */ 582 #ifndef _SYS_SYSPROTO_H_ 583 struct freebsd4_getfsstat_args { 584 struct ostatfs *buf; 585 long bufsize; 586 int mode; 587 }; 588 #endif 589 int 590 freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) 591 { 592 struct statfs *buf, *sp; 593 struct ostatfs osb; 594 size_t count, size; 595 int error; 596 597 if (uap->bufsize < 0) 598 return (EINVAL); 599 count = uap->bufsize / sizeof(struct ostatfs); 600 if (count > SIZE_MAX / sizeof(struct statfs)) 601 return (EINVAL); 602 size = count * sizeof(struct statfs); 603 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 604 uap->mode); 605 if (error == 0) 606 td->td_retval[0] = count; 607 if (size != 0) { 608 sp = buf; 609 while (count != 0 && error == 0) { 610 freebsd4_cvtstatfs(sp, &osb); 611 error = copyout(&osb, uap->buf, sizeof(osb)); 612 sp++; 613 uap->buf++; 614 count--; 615 } 616 free(buf, M_STATFS); 617 } 618 return (error); 619 } 620 621 /* 622 * Implement fstatfs() for (NFS) file handles. 623 */ 624 #ifndef _SYS_SYSPROTO_H_ 625 struct freebsd4_fhstatfs_args { 626 struct fhandle *u_fhp; 627 struct ostatfs *buf; 628 }; 629 #endif 630 int 631 freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) 632 { 633 struct ostatfs osb; 634 struct statfs *sfp; 635 fhandle_t fh; 636 int error; 637 638 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 639 if (error != 0) 640 return (error); 641 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 642 error = kern_fhstatfs(td, fh, sfp); 643 if (error == 0) { 644 freebsd4_cvtstatfs(sfp, &osb); 645 error = copyout(&osb, uap->buf, sizeof(osb)); 646 } 647 free(sfp, M_STATFS); 648 return (error); 649 } 650 651 /* 652 * Convert a new format statfs structure to an old format statfs structure. 653 */ 654 static void 655 freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) 656 { 657 658 statfs_scale_blocks(nsp, LONG_MAX); 659 bzero(osp, sizeof(*osp)); 660 osp->f_bsize = nsp->f_bsize; 661 osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); 662 osp->f_blocks = nsp->f_blocks; 663 osp->f_bfree = nsp->f_bfree; 664 osp->f_bavail = nsp->f_bavail; 665 osp->f_files = MIN(nsp->f_files, LONG_MAX); 666 osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); 667 osp->f_owner = nsp->f_owner; 668 osp->f_type = nsp->f_type; 669 osp->f_flags = nsp->f_flags; 670 osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); 671 osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); 672 osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); 673 osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); 674 strlcpy(osp->f_fstypename, nsp->f_fstypename, 675 MIN(MFSNAMELEN, OMFSNAMELEN)); 676 strlcpy(osp->f_mntonname, nsp->f_mntonname, 677 MIN(MNAMELEN, OMNAMELEN)); 678 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 679 MIN(MNAMELEN, OMNAMELEN)); 680 osp->f_fsid = nsp->f_fsid; 681 } 682 #endif /* COMPAT_FREEBSD4 */ 683 684 #if defined(COMPAT_FREEBSD11) 685 /* 686 * Get old format filesystem statistics. 687 */ 688 static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); 689 690 int 691 freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) 692 { 693 struct freebsd11_statfs osb; 694 struct statfs *sfp; 695 int error; 696 697 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 698 error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); 699 if (error == 0) { 700 freebsd11_cvtstatfs(sfp, &osb); 701 error = copyout(&osb, uap->buf, sizeof(osb)); 702 } 703 free(sfp, M_STATFS); 704 return (error); 705 } 706 707 /* 708 * Get filesystem statistics. 709 */ 710 int 711 freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) 712 { 713 struct freebsd11_statfs osb; 714 struct statfs *sfp; 715 int error; 716 717 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 718 error = kern_fstatfs(td, uap->fd, sfp); 719 if (error == 0) { 720 freebsd11_cvtstatfs(sfp, &osb); 721 error = copyout(&osb, uap->buf, sizeof(osb)); 722 } 723 free(sfp, M_STATFS); 724 return (error); 725 } 726 727 /* 728 * Get statistics on all filesystems. 729 */ 730 int 731 freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) 732 { 733 struct freebsd11_statfs osb; 734 struct statfs *buf, *sp; 735 size_t count, size; 736 int error; 737 738 count = uap->bufsize / sizeof(struct ostatfs); 739 size = count * sizeof(struct statfs); 740 error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, 741 uap->mode); 742 if (error == 0) 743 td->td_retval[0] = count; 744 if (size > 0) { 745 sp = buf; 746 while (count > 0 && error == 0) { 747 freebsd11_cvtstatfs(sp, &osb); 748 error = copyout(&osb, uap->buf, sizeof(osb)); 749 sp++; 750 uap->buf++; 751 count--; 752 } 753 free(buf, M_STATFS); 754 } 755 return (error); 756 } 757 758 /* 759 * Implement fstatfs() for (NFS) file handles. 760 */ 761 int 762 freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) 763 { 764 struct freebsd11_statfs osb; 765 struct statfs *sfp; 766 fhandle_t fh; 767 int error; 768 769 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 770 if (error) 771 return (error); 772 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 773 error = kern_fhstatfs(td, fh, sfp); 774 if (error == 0) { 775 freebsd11_cvtstatfs(sfp, &osb); 776 error = copyout(&osb, uap->buf, sizeof(osb)); 777 } 778 free(sfp, M_STATFS); 779 return (error); 780 } 781 782 /* 783 * Convert a new format statfs structure to an old format statfs structure. 784 */ 785 static void 786 freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) 787 { 788 789 bzero(osp, sizeof(*osp)); 790 osp->f_version = FREEBSD11_STATFS_VERSION; 791 osp->f_type = nsp->f_type; 792 osp->f_flags = nsp->f_flags; 793 osp->f_bsize = nsp->f_bsize; 794 osp->f_iosize = nsp->f_iosize; 795 osp->f_blocks = nsp->f_blocks; 796 osp->f_bfree = nsp->f_bfree; 797 osp->f_bavail = nsp->f_bavail; 798 osp->f_files = nsp->f_files; 799 osp->f_ffree = nsp->f_ffree; 800 osp->f_syncwrites = nsp->f_syncwrites; 801 osp->f_asyncwrites = nsp->f_asyncwrites; 802 osp->f_syncreads = nsp->f_syncreads; 803 osp->f_asyncreads = nsp->f_asyncreads; 804 osp->f_namemax = nsp->f_namemax; 805 osp->f_owner = nsp->f_owner; 806 osp->f_fsid = nsp->f_fsid; 807 strlcpy(osp->f_fstypename, nsp->f_fstypename, 808 MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); 809 strlcpy(osp->f_mntonname, nsp->f_mntonname, 810 MIN(MNAMELEN, sizeof(osp->f_mntonname))); 811 strlcpy(osp->f_mntfromname, nsp->f_mntfromname, 812 MIN(MNAMELEN, sizeof(osp->f_mntfromname))); 813 } 814 #endif /* COMPAT_FREEBSD11 */ 815 816 /* 817 * Change current working directory to a given file descriptor. 818 */ 819 #ifndef _SYS_SYSPROTO_H_ 820 struct fchdir_args { 821 int fd; 822 }; 823 #endif 824 int 825 sys_fchdir(struct thread *td, struct fchdir_args *uap) 826 { 827 struct vnode *vp, *tdp; 828 struct mount *mp; 829 struct file *fp; 830 cap_rights_t rights; 831 int error; 832 833 AUDIT_ARG_FD(uap->fd); 834 error = getvnode(td, uap->fd, cap_rights_init(&rights, CAP_FCHDIR), 835 &fp); 836 if (error != 0) 837 return (error); 838 vp = fp->f_vnode; 839 vrefact(vp); 840 fdrop(fp, td); 841 vn_lock(vp, LK_SHARED | LK_RETRY); 842 AUDIT_ARG_VNODE1(vp); 843 error = change_dir(vp, td); 844 while (!error && (mp = vp->v_mountedhere) != NULL) { 845 if (vfs_busy(mp, 0)) 846 continue; 847 error = VFS_ROOT(mp, LK_SHARED, &tdp); 848 vfs_unbusy(mp); 849 if (error != 0) 850 break; 851 vput(vp); 852 vp = tdp; 853 } 854 if (error != 0) { 855 vput(vp); 856 return (error); 857 } 858 VOP_UNLOCK(vp, 0); 859 pwd_chdir(td, vp); 860 return (0); 861 } 862 863 /* 864 * Change current working directory (``.''). 865 */ 866 #ifndef _SYS_SYSPROTO_H_ 867 struct chdir_args { 868 char *path; 869 }; 870 #endif 871 int 872 sys_chdir(struct thread *td, struct chdir_args *uap) 873 { 874 875 return (kern_chdir(td, uap->path, UIO_USERSPACE)); 876 } 877 878 int 879 kern_chdir(struct thread *td, char *path, enum uio_seg pathseg) 880 { 881 struct nameidata nd; 882 int error; 883 884 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 885 pathseg, path, td); 886 if ((error = namei(&nd)) != 0) 887 return (error); 888 if ((error = change_dir(nd.ni_vp, td)) != 0) { 889 vput(nd.ni_vp); 890 NDFREE(&nd, NDF_ONLY_PNBUF); 891 return (error); 892 } 893 VOP_UNLOCK(nd.ni_vp, 0); 894 NDFREE(&nd, NDF_ONLY_PNBUF); 895 pwd_chdir(td, nd.ni_vp); 896 return (0); 897 } 898 899 /* 900 * Change notion of root (``/'') directory. 901 */ 902 #ifndef _SYS_SYSPROTO_H_ 903 struct chroot_args { 904 char *path; 905 }; 906 #endif 907 int 908 sys_chroot(struct thread *td, struct chroot_args *uap) 909 { 910 struct nameidata nd; 911 int error; 912 913 error = priv_check(td, PRIV_VFS_CHROOT); 914 if (error != 0) 915 return (error); 916 NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 917 UIO_USERSPACE, uap->path, td); 918 error = namei(&nd); 919 if (error != 0) 920 goto error; 921 error = change_dir(nd.ni_vp, td); 922 if (error != 0) 923 goto e_vunlock; 924 #ifdef MAC 925 error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); 926 if (error != 0) 927 goto e_vunlock; 928 #endif 929 VOP_UNLOCK(nd.ni_vp, 0); 930 error = pwd_chroot(td, nd.ni_vp); 931 vrele(nd.ni_vp); 932 NDFREE(&nd, NDF_ONLY_PNBUF); 933 return (error); 934 e_vunlock: 935 vput(nd.ni_vp); 936 error: 937 NDFREE(&nd, NDF_ONLY_PNBUF); 938 return (error); 939 } 940 941 /* 942 * Common routine for chroot and chdir. Callers must provide a locked vnode 943 * instance. 944 */ 945 int 946 change_dir(struct vnode *vp, struct thread *td) 947 { 948 #ifdef MAC 949 int error; 950 #endif 951 952 ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); 953 if (vp->v_type != VDIR) 954 return (ENOTDIR); 955 #ifdef MAC 956 error = mac_vnode_check_chdir(td->td_ucred, vp); 957 if (error != 0) 958 return (error); 959 #endif 960 return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); 961 } 962 963 static __inline void 964 flags_to_rights(int flags, cap_rights_t *rightsp) 965 { 966 967 if (flags & O_EXEC) { 968 cap_rights_set(rightsp, CAP_FEXECVE); 969 } else { 970 switch ((flags & O_ACCMODE)) { 971 case O_RDONLY: 972 cap_rights_set(rightsp, CAP_READ); 973 break; 974 case O_RDWR: 975 cap_rights_set(rightsp, CAP_READ); 976 /* FALLTHROUGH */ 977 case O_WRONLY: 978 cap_rights_set(rightsp, CAP_WRITE); 979 if (!(flags & (O_APPEND | O_TRUNC))) 980 cap_rights_set(rightsp, CAP_SEEK); 981 break; 982 } 983 } 984 985 if (flags & O_CREAT) 986 cap_rights_set(rightsp, CAP_CREATE); 987 988 if (flags & O_TRUNC) 989 cap_rights_set(rightsp, CAP_FTRUNCATE); 990 991 if (flags & (O_SYNC | O_FSYNC)) 992 cap_rights_set(rightsp, CAP_FSYNC); 993 994 if (flags & (O_EXLOCK | O_SHLOCK)) 995 cap_rights_set(rightsp, CAP_FLOCK); 996 } 997 998 /* 999 * Check permissions, allocate an open file structure, and call the device 1000 * open routine if any. 1001 */ 1002 #ifndef _SYS_SYSPROTO_H_ 1003 struct open_args { 1004 char *path; 1005 int flags; 1006 int mode; 1007 }; 1008 #endif 1009 int 1010 sys_open(struct thread *td, struct open_args *uap) 1011 { 1012 1013 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1014 uap->flags, uap->mode)); 1015 } 1016 1017 #ifndef _SYS_SYSPROTO_H_ 1018 struct openat_args { 1019 int fd; 1020 char *path; 1021 int flag; 1022 int mode; 1023 }; 1024 #endif 1025 int 1026 sys_openat(struct thread *td, struct openat_args *uap) 1027 { 1028 1029 AUDIT_ARG_FD(uap->fd); 1030 return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1031 uap->mode)); 1032 } 1033 1034 int 1035 kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1036 int flags, int mode) 1037 { 1038 struct proc *p = td->td_proc; 1039 struct filedesc *fdp = p->p_fd; 1040 struct file *fp; 1041 struct vnode *vp; 1042 struct nameidata nd; 1043 cap_rights_t rights; 1044 int cmode, error, indx; 1045 1046 indx = -1; 1047 1048 AUDIT_ARG_FFLAGS(flags); 1049 AUDIT_ARG_MODE(mode); 1050 cap_rights_init(&rights, CAP_LOOKUP); 1051 flags_to_rights(flags, &rights); 1052 /* 1053 * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags 1054 * may be specified. 1055 */ 1056 if (flags & O_EXEC) { 1057 if (flags & O_ACCMODE) 1058 return (EINVAL); 1059 } else if ((flags & O_ACCMODE) == O_ACCMODE) { 1060 return (EINVAL); 1061 } else { 1062 flags = FFLAGS(flags); 1063 } 1064 1065 /* 1066 * Allocate a file structure. The descriptor to reference it 1067 * is allocated and set by finstall() below. 1068 */ 1069 error = falloc_noinstall(td, &fp); 1070 if (error != 0) 1071 return (error); 1072 /* 1073 * An extra reference on `fp' has been held for us by 1074 * falloc_noinstall(). 1075 */ 1076 /* Set the flags early so the finit in devfs can pick them up. */ 1077 fp->f_flag = flags & FMASK; 1078 cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; 1079 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 1080 &rights, td); 1081 td->td_dupfd = -1; /* XXX check for fdopen */ 1082 error = vn_open(&nd, &flags, cmode, fp); 1083 if (error != 0) { 1084 /* 1085 * If the vn_open replaced the method vector, something 1086 * wonderous happened deep below and we just pass it up 1087 * pretending we know what we do. 1088 */ 1089 if (error == ENXIO && fp->f_ops != &badfileops) 1090 goto success; 1091 1092 /* 1093 * Handle special fdopen() case. bleh. 1094 * 1095 * Don't do this for relative (capability) lookups; we don't 1096 * understand exactly what would happen, and we don't think 1097 * that it ever should. 1098 */ 1099 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 && 1100 (error == ENODEV || error == ENXIO) && 1101 td->td_dupfd >= 0) { 1102 error = dupfdopen(td, fdp, td->td_dupfd, flags, error, 1103 &indx); 1104 if (error == 0) 1105 goto success; 1106 } 1107 1108 goto bad; 1109 } 1110 td->td_dupfd = 0; 1111 NDFREE(&nd, NDF_ONLY_PNBUF); 1112 vp = nd.ni_vp; 1113 1114 /* 1115 * Store the vnode, for any f_type. Typically, the vnode use 1116 * count is decremented by direct call to vn_closefile() for 1117 * files that switched type in the cdevsw fdopen() method. 1118 */ 1119 fp->f_vnode = vp; 1120 /* 1121 * If the file wasn't claimed by devfs bind it to the normal 1122 * vnode operations here. 1123 */ 1124 if (fp->f_ops == &badfileops) { 1125 KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); 1126 fp->f_seqcount = 1; 1127 finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK), 1128 DTYPE_VNODE, vp, &vnops); 1129 } 1130 1131 VOP_UNLOCK(vp, 0); 1132 if (flags & O_TRUNC) { 1133 error = fo_truncate(fp, 0, td->td_ucred, td); 1134 if (error != 0) 1135 goto bad; 1136 } 1137 success: 1138 /* 1139 * If we haven't already installed the FD (for dupfdopen), do so now. 1140 */ 1141 if (indx == -1) { 1142 struct filecaps *fcaps; 1143 1144 #ifdef CAPABILITIES 1145 if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0) 1146 fcaps = &nd.ni_filecaps; 1147 else 1148 #endif 1149 fcaps = NULL; 1150 error = finstall(td, fp, &indx, flags, fcaps); 1151 /* On success finstall() consumes fcaps. */ 1152 if (error != 0) { 1153 filecaps_free(&nd.ni_filecaps); 1154 goto bad; 1155 } 1156 } else { 1157 filecaps_free(&nd.ni_filecaps); 1158 } 1159 1160 /* 1161 * Release our private reference, leaving the one associated with 1162 * the descriptor table intact. 1163 */ 1164 fdrop(fp, td); 1165 td->td_retval[0] = indx; 1166 return (0); 1167 bad: 1168 KASSERT(indx == -1, ("indx=%d, should be -1", indx)); 1169 fdrop(fp, td); 1170 return (error); 1171 } 1172 1173 #ifdef COMPAT_43 1174 /* 1175 * Create a file. 1176 */ 1177 #ifndef _SYS_SYSPROTO_H_ 1178 struct ocreat_args { 1179 char *path; 1180 int mode; 1181 }; 1182 #endif 1183 int 1184 ocreat(struct thread *td, struct ocreat_args *uap) 1185 { 1186 1187 return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1188 O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); 1189 } 1190 #endif /* COMPAT_43 */ 1191 1192 /* 1193 * Create a special file. 1194 */ 1195 #ifndef _SYS_SYSPROTO_H_ 1196 struct mknodat_args { 1197 int fd; 1198 char *path; 1199 mode_t mode; 1200 dev_t dev; 1201 }; 1202 #endif 1203 int 1204 sys_mknodat(struct thread *td, struct mknodat_args *uap) 1205 { 1206 1207 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1208 uap->dev)); 1209 } 1210 1211 #if defined(COMPAT_FREEBSD11) 1212 int 1213 freebsd11_mknod(struct thread *td, 1214 struct freebsd11_mknod_args *uap) 1215 { 1216 1217 return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1218 uap->mode, uap->dev)); 1219 } 1220 1221 int 1222 freebsd11_mknodat(struct thread *td, 1223 struct freebsd11_mknodat_args *uap) 1224 { 1225 1226 return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, 1227 uap->dev)); 1228 } 1229 #endif /* COMPAT_FREEBSD11 */ 1230 1231 int 1232 kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1233 int mode, dev_t dev) 1234 { 1235 struct vnode *vp; 1236 struct mount *mp; 1237 struct vattr vattr; 1238 struct nameidata nd; 1239 cap_rights_t rights; 1240 int error, whiteout = 0; 1241 1242 AUDIT_ARG_MODE(mode); 1243 AUDIT_ARG_DEV(dev); 1244 switch (mode & S_IFMT) { 1245 case S_IFCHR: 1246 case S_IFBLK: 1247 error = priv_check(td, PRIV_VFS_MKNOD_DEV); 1248 if (error == 0 && dev == VNOVAL) 1249 error = EINVAL; 1250 break; 1251 case S_IFMT: 1252 error = priv_check(td, PRIV_VFS_MKNOD_BAD); 1253 break; 1254 case S_IFWHT: 1255 error = priv_check(td, PRIV_VFS_MKNOD_WHT); 1256 break; 1257 case S_IFIFO: 1258 if (dev == 0) 1259 return (kern_mkfifoat(td, fd, path, pathseg, mode)); 1260 /* FALLTHROUGH */ 1261 default: 1262 error = EINVAL; 1263 break; 1264 } 1265 if (error != 0) 1266 return (error); 1267 restart: 1268 bwillwrite(); 1269 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1270 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKNODAT), 1271 td); 1272 if ((error = namei(&nd)) != 0) 1273 return (error); 1274 vp = nd.ni_vp; 1275 if (vp != NULL) { 1276 NDFREE(&nd, NDF_ONLY_PNBUF); 1277 if (vp == nd.ni_dvp) 1278 vrele(nd.ni_dvp); 1279 else 1280 vput(nd.ni_dvp); 1281 vrele(vp); 1282 return (EEXIST); 1283 } else { 1284 VATTR_NULL(&vattr); 1285 vattr.va_mode = (mode & ALLPERMS) & 1286 ~td->td_proc->p_fd->fd_cmask; 1287 vattr.va_rdev = dev; 1288 whiteout = 0; 1289 1290 switch (mode & S_IFMT) { 1291 case S_IFMT: /* used by badsect to flag bad sectors */ 1292 vattr.va_type = VBAD; 1293 break; 1294 case S_IFCHR: 1295 vattr.va_type = VCHR; 1296 break; 1297 case S_IFBLK: 1298 vattr.va_type = VBLK; 1299 break; 1300 case S_IFWHT: 1301 whiteout = 1; 1302 break; 1303 default: 1304 panic("kern_mknod: invalid mode"); 1305 } 1306 } 1307 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1308 NDFREE(&nd, NDF_ONLY_PNBUF); 1309 vput(nd.ni_dvp); 1310 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1311 return (error); 1312 goto restart; 1313 } 1314 #ifdef MAC 1315 if (error == 0 && !whiteout) 1316 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, 1317 &nd.ni_cnd, &vattr); 1318 #endif 1319 if (error == 0) { 1320 if (whiteout) 1321 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1322 else { 1323 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1324 &nd.ni_cnd, &vattr); 1325 if (error == 0) 1326 vput(nd.ni_vp); 1327 } 1328 } 1329 NDFREE(&nd, NDF_ONLY_PNBUF); 1330 vput(nd.ni_dvp); 1331 vn_finished_write(mp); 1332 return (error); 1333 } 1334 1335 /* 1336 * Create a named pipe. 1337 */ 1338 #ifndef _SYS_SYSPROTO_H_ 1339 struct mkfifo_args { 1340 char *path; 1341 int mode; 1342 }; 1343 #endif 1344 int 1345 sys_mkfifo(struct thread *td, struct mkfifo_args *uap) 1346 { 1347 1348 return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1349 uap->mode)); 1350 } 1351 1352 #ifndef _SYS_SYSPROTO_H_ 1353 struct mkfifoat_args { 1354 int fd; 1355 char *path; 1356 mode_t mode; 1357 }; 1358 #endif 1359 int 1360 sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) 1361 { 1362 1363 return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, 1364 uap->mode)); 1365 } 1366 1367 int 1368 kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1369 int mode) 1370 { 1371 struct mount *mp; 1372 struct vattr vattr; 1373 struct nameidata nd; 1374 cap_rights_t rights; 1375 int error; 1376 1377 AUDIT_ARG_MODE(mode); 1378 restart: 1379 bwillwrite(); 1380 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1381 NOCACHE, pathseg, path, fd, cap_rights_init(&rights, CAP_MKFIFOAT), 1382 td); 1383 if ((error = namei(&nd)) != 0) 1384 return (error); 1385 if (nd.ni_vp != NULL) { 1386 NDFREE(&nd, NDF_ONLY_PNBUF); 1387 if (nd.ni_vp == nd.ni_dvp) 1388 vrele(nd.ni_dvp); 1389 else 1390 vput(nd.ni_dvp); 1391 vrele(nd.ni_vp); 1392 return (EEXIST); 1393 } 1394 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1395 NDFREE(&nd, NDF_ONLY_PNBUF); 1396 vput(nd.ni_dvp); 1397 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1398 return (error); 1399 goto restart; 1400 } 1401 VATTR_NULL(&vattr); 1402 vattr.va_type = VFIFO; 1403 vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; 1404 #ifdef MAC 1405 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1406 &vattr); 1407 if (error != 0) 1408 goto out; 1409 #endif 1410 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1411 if (error == 0) 1412 vput(nd.ni_vp); 1413 #ifdef MAC 1414 out: 1415 #endif 1416 vput(nd.ni_dvp); 1417 vn_finished_write(mp); 1418 NDFREE(&nd, NDF_ONLY_PNBUF); 1419 return (error); 1420 } 1421 1422 /* 1423 * Make a hard file link. 1424 */ 1425 #ifndef _SYS_SYSPROTO_H_ 1426 struct link_args { 1427 char *path; 1428 char *link; 1429 }; 1430 #endif 1431 int 1432 sys_link(struct thread *td, struct link_args *uap) 1433 { 1434 1435 return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, 1436 UIO_USERSPACE, FOLLOW)); 1437 } 1438 1439 #ifndef _SYS_SYSPROTO_H_ 1440 struct linkat_args { 1441 int fd1; 1442 char *path1; 1443 int fd2; 1444 char *path2; 1445 int flag; 1446 }; 1447 #endif 1448 int 1449 sys_linkat(struct thread *td, struct linkat_args *uap) 1450 { 1451 int flag; 1452 1453 flag = uap->flag; 1454 if (flag & ~AT_SYMLINK_FOLLOW) 1455 return (EINVAL); 1456 1457 return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, 1458 UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW)); 1459 } 1460 1461 int hardlink_check_uid = 0; 1462 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, 1463 &hardlink_check_uid, 0, 1464 "Unprivileged processes cannot create hard links to files owned by other " 1465 "users"); 1466 static int hardlink_check_gid = 0; 1467 SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, 1468 &hardlink_check_gid, 0, 1469 "Unprivileged processes cannot create hard links to files owned by other " 1470 "groups"); 1471 1472 static int 1473 can_hardlink(struct vnode *vp, struct ucred *cred) 1474 { 1475 struct vattr va; 1476 int error; 1477 1478 if (!hardlink_check_uid && !hardlink_check_gid) 1479 return (0); 1480 1481 error = VOP_GETATTR(vp, &va, cred); 1482 if (error != 0) 1483 return (error); 1484 1485 if (hardlink_check_uid && cred->cr_uid != va.va_uid) { 1486 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1487 if (error != 0) 1488 return (error); 1489 } 1490 1491 if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { 1492 error = priv_check_cred(cred, PRIV_VFS_LINK, 0); 1493 if (error != 0) 1494 return (error); 1495 } 1496 1497 return (0); 1498 } 1499 1500 int 1501 kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2, 1502 enum uio_seg segflg, int follow) 1503 { 1504 struct vnode *vp; 1505 struct mount *mp; 1506 struct nameidata nd; 1507 cap_rights_t rights; 1508 int error; 1509 1510 again: 1511 bwillwrite(); 1512 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflg, path1, fd1, 1513 cap_rights_init(&rights, CAP_LINKAT_SOURCE), td); 1514 1515 if ((error = namei(&nd)) != 0) 1516 return (error); 1517 NDFREE(&nd, NDF_ONLY_PNBUF); 1518 vp = nd.ni_vp; 1519 if (vp->v_type == VDIR) { 1520 vrele(vp); 1521 return (EPERM); /* POSIX */ 1522 } 1523 NDINIT_ATRIGHTS(&nd, CREATE, 1524 LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflg, path2, fd2, 1525 cap_rights_init(&rights, CAP_LINKAT_TARGET), td); 1526 if ((error = namei(&nd)) == 0) { 1527 if (nd.ni_vp != NULL) { 1528 NDFREE(&nd, NDF_ONLY_PNBUF); 1529 if (nd.ni_dvp == nd.ni_vp) 1530 vrele(nd.ni_dvp); 1531 else 1532 vput(nd.ni_dvp); 1533 vrele(nd.ni_vp); 1534 vrele(vp); 1535 return (EEXIST); 1536 } else if (nd.ni_dvp->v_mount != vp->v_mount) { 1537 /* 1538 * Cross-device link. No need to recheck 1539 * vp->v_type, since it cannot change, except 1540 * to VBAD. 1541 */ 1542 NDFREE(&nd, NDF_ONLY_PNBUF); 1543 vput(nd.ni_dvp); 1544 vrele(vp); 1545 return (EXDEV); 1546 } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { 1547 error = can_hardlink(vp, td->td_ucred); 1548 #ifdef MAC 1549 if (error == 0) 1550 error = mac_vnode_check_link(td->td_ucred, 1551 nd.ni_dvp, vp, &nd.ni_cnd); 1552 #endif 1553 if (error != 0) { 1554 vput(vp); 1555 vput(nd.ni_dvp); 1556 NDFREE(&nd, NDF_ONLY_PNBUF); 1557 return (error); 1558 } 1559 error = vn_start_write(vp, &mp, V_NOWAIT); 1560 if (error != 0) { 1561 vput(vp); 1562 vput(nd.ni_dvp); 1563 NDFREE(&nd, NDF_ONLY_PNBUF); 1564 error = vn_start_write(NULL, &mp, 1565 V_XSLEEP | PCATCH); 1566 if (error != 0) 1567 return (error); 1568 goto again; 1569 } 1570 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1571 VOP_UNLOCK(vp, 0); 1572 vput(nd.ni_dvp); 1573 vn_finished_write(mp); 1574 NDFREE(&nd, NDF_ONLY_PNBUF); 1575 } else { 1576 vput(nd.ni_dvp); 1577 NDFREE(&nd, NDF_ONLY_PNBUF); 1578 vrele(vp); 1579 goto again; 1580 } 1581 } 1582 vrele(vp); 1583 return (error); 1584 } 1585 1586 /* 1587 * Make a symbolic link. 1588 */ 1589 #ifndef _SYS_SYSPROTO_H_ 1590 struct symlink_args { 1591 char *path; 1592 char *link; 1593 }; 1594 #endif 1595 int 1596 sys_symlink(struct thread *td, struct symlink_args *uap) 1597 { 1598 1599 return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, 1600 UIO_USERSPACE)); 1601 } 1602 1603 #ifndef _SYS_SYSPROTO_H_ 1604 struct symlinkat_args { 1605 char *path; 1606 int fd; 1607 char *path2; 1608 }; 1609 #endif 1610 int 1611 sys_symlinkat(struct thread *td, struct symlinkat_args *uap) 1612 { 1613 1614 return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, 1615 UIO_USERSPACE)); 1616 } 1617 1618 int 1619 kern_symlinkat(struct thread *td, char *path1, int fd, char *path2, 1620 enum uio_seg segflg) 1621 { 1622 struct mount *mp; 1623 struct vattr vattr; 1624 char *syspath; 1625 struct nameidata nd; 1626 int error; 1627 cap_rights_t rights; 1628 1629 if (segflg == UIO_SYSSPACE) { 1630 syspath = path1; 1631 } else { 1632 syspath = uma_zalloc(namei_zone, M_WAITOK); 1633 if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0) 1634 goto out; 1635 } 1636 AUDIT_ARG_TEXT(syspath); 1637 restart: 1638 bwillwrite(); 1639 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 1640 NOCACHE, segflg, path2, fd, cap_rights_init(&rights, CAP_SYMLINKAT), 1641 td); 1642 if ((error = namei(&nd)) != 0) 1643 goto out; 1644 if (nd.ni_vp) { 1645 NDFREE(&nd, NDF_ONLY_PNBUF); 1646 if (nd.ni_vp == nd.ni_dvp) 1647 vrele(nd.ni_dvp); 1648 else 1649 vput(nd.ni_dvp); 1650 vrele(nd.ni_vp); 1651 error = EEXIST; 1652 goto out; 1653 } 1654 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1655 NDFREE(&nd, NDF_ONLY_PNBUF); 1656 vput(nd.ni_dvp); 1657 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1658 goto out; 1659 goto restart; 1660 } 1661 VATTR_NULL(&vattr); 1662 vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; 1663 #ifdef MAC 1664 vattr.va_type = VLNK; 1665 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 1666 &vattr); 1667 if (error != 0) 1668 goto out2; 1669 #endif 1670 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); 1671 if (error == 0) 1672 vput(nd.ni_vp); 1673 #ifdef MAC 1674 out2: 1675 #endif 1676 NDFREE(&nd, NDF_ONLY_PNBUF); 1677 vput(nd.ni_dvp); 1678 vn_finished_write(mp); 1679 out: 1680 if (segflg != UIO_SYSSPACE) 1681 uma_zfree(namei_zone, syspath); 1682 return (error); 1683 } 1684 1685 /* 1686 * Delete a whiteout from the filesystem. 1687 */ 1688 #ifndef _SYS_SYSPROTO_H_ 1689 struct undelete_args { 1690 char *path; 1691 }; 1692 #endif 1693 int 1694 sys_undelete(struct thread *td, struct undelete_args *uap) 1695 { 1696 struct mount *mp; 1697 struct nameidata nd; 1698 int error; 1699 1700 restart: 1701 bwillwrite(); 1702 NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, 1703 UIO_USERSPACE, uap->path, td); 1704 error = namei(&nd); 1705 if (error != 0) 1706 return (error); 1707 1708 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1709 NDFREE(&nd, NDF_ONLY_PNBUF); 1710 if (nd.ni_vp == nd.ni_dvp) 1711 vrele(nd.ni_dvp); 1712 else 1713 vput(nd.ni_dvp); 1714 if (nd.ni_vp) 1715 vrele(nd.ni_vp); 1716 return (EEXIST); 1717 } 1718 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1719 NDFREE(&nd, NDF_ONLY_PNBUF); 1720 vput(nd.ni_dvp); 1721 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 1722 return (error); 1723 goto restart; 1724 } 1725 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); 1726 NDFREE(&nd, NDF_ONLY_PNBUF); 1727 vput(nd.ni_dvp); 1728 vn_finished_write(mp); 1729 return (error); 1730 } 1731 1732 /* 1733 * Delete a name from the filesystem. 1734 */ 1735 #ifndef _SYS_SYSPROTO_H_ 1736 struct unlink_args { 1737 char *path; 1738 }; 1739 #endif 1740 int 1741 sys_unlink(struct thread *td, struct unlink_args *uap) 1742 { 1743 1744 return (kern_unlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0)); 1745 } 1746 1747 #ifndef _SYS_SYSPROTO_H_ 1748 struct unlinkat_args { 1749 int fd; 1750 char *path; 1751 int flag; 1752 }; 1753 #endif 1754 int 1755 sys_unlinkat(struct thread *td, struct unlinkat_args *uap) 1756 { 1757 int flag = uap->flag; 1758 int fd = uap->fd; 1759 char *path = uap->path; 1760 1761 if (flag & ~AT_REMOVEDIR) 1762 return (EINVAL); 1763 1764 if (flag & AT_REMOVEDIR) 1765 return (kern_rmdirat(td, fd, path, UIO_USERSPACE)); 1766 else 1767 return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0)); 1768 } 1769 1770 int 1771 kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1772 ino_t oldinum) 1773 { 1774 struct mount *mp; 1775 struct vnode *vp; 1776 struct nameidata nd; 1777 struct stat sb; 1778 cap_rights_t rights; 1779 int error; 1780 1781 restart: 1782 bwillwrite(); 1783 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, 1784 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td); 1785 if ((error = namei(&nd)) != 0) 1786 return (error == EINVAL ? EPERM : error); 1787 vp = nd.ni_vp; 1788 if (vp->v_type == VDIR && oldinum == 0) { 1789 error = EPERM; /* POSIX */ 1790 } else if (oldinum != 0 && 1791 ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && 1792 sb.st_ino != oldinum) { 1793 error = EIDRM; /* Identifier removed */ 1794 } else { 1795 /* 1796 * The root of a mounted filesystem cannot be deleted. 1797 * 1798 * XXX: can this only be a VDIR case? 1799 */ 1800 if (vp->v_vflag & VV_ROOT) 1801 error = EBUSY; 1802 } 1803 if (error == 0) { 1804 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1805 NDFREE(&nd, NDF_ONLY_PNBUF); 1806 vput(nd.ni_dvp); 1807 if (vp == nd.ni_dvp) 1808 vrele(vp); 1809 else 1810 vput(vp); 1811 if ((error = vn_start_write(NULL, &mp, 1812 V_XSLEEP | PCATCH)) != 0) 1813 return (error); 1814 goto restart; 1815 } 1816 #ifdef MAC 1817 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 1818 &nd.ni_cnd); 1819 if (error != 0) 1820 goto out; 1821 #endif 1822 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 1823 error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); 1824 #ifdef MAC 1825 out: 1826 #endif 1827 vn_finished_write(mp); 1828 } 1829 NDFREE(&nd, NDF_ONLY_PNBUF); 1830 vput(nd.ni_dvp); 1831 if (vp == nd.ni_dvp) 1832 vrele(vp); 1833 else 1834 vput(vp); 1835 return (error); 1836 } 1837 1838 /* 1839 * Reposition read/write file offset. 1840 */ 1841 #ifndef _SYS_SYSPROTO_H_ 1842 struct lseek_args { 1843 int fd; 1844 int pad; 1845 off_t offset; 1846 int whence; 1847 }; 1848 #endif 1849 int 1850 sys_lseek(struct thread *td, struct lseek_args *uap) 1851 { 1852 1853 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1854 } 1855 1856 int 1857 kern_lseek(struct thread *td, int fd, off_t offset, int whence) 1858 { 1859 struct file *fp; 1860 cap_rights_t rights; 1861 int error; 1862 1863 AUDIT_ARG_FD(fd); 1864 error = fget(td, fd, cap_rights_init(&rights, CAP_SEEK), &fp); 1865 if (error != 0) 1866 return (error); 1867 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1868 fo_seek(fp, offset, whence, td) : ESPIPE; 1869 fdrop(fp, td); 1870 return (error); 1871 } 1872 1873 #if defined(COMPAT_43) 1874 /* 1875 * Reposition read/write file offset. 1876 */ 1877 #ifndef _SYS_SYSPROTO_H_ 1878 struct olseek_args { 1879 int fd; 1880 long offset; 1881 int whence; 1882 }; 1883 #endif 1884 int 1885 olseek(struct thread *td, struct olseek_args *uap) 1886 { 1887 1888 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1889 } 1890 #endif /* COMPAT_43 */ 1891 1892 #if defined(COMPAT_FREEBSD6) 1893 /* Version with the 'pad' argument */ 1894 int 1895 freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) 1896 { 1897 1898 return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); 1899 } 1900 #endif 1901 1902 /* 1903 * Check access permissions using passed credentials. 1904 */ 1905 static int 1906 vn_access(struct vnode *vp, int user_flags, struct ucred *cred, 1907 struct thread *td) 1908 { 1909 accmode_t accmode; 1910 int error; 1911 1912 /* Flags == 0 means only check for existence. */ 1913 if (user_flags == 0) 1914 return (0); 1915 1916 accmode = 0; 1917 if (user_flags & R_OK) 1918 accmode |= VREAD; 1919 if (user_flags & W_OK) 1920 accmode |= VWRITE; 1921 if (user_flags & X_OK) 1922 accmode |= VEXEC; 1923 #ifdef MAC 1924 error = mac_vnode_check_access(cred, vp, accmode); 1925 if (error != 0) 1926 return (error); 1927 #endif 1928 if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) 1929 error = VOP_ACCESS(vp, accmode, cred, td); 1930 return (error); 1931 } 1932 1933 /* 1934 * Check access permissions using "real" credentials. 1935 */ 1936 #ifndef _SYS_SYSPROTO_H_ 1937 struct access_args { 1938 char *path; 1939 int amode; 1940 }; 1941 #endif 1942 int 1943 sys_access(struct thread *td, struct access_args *uap) 1944 { 1945 1946 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 1947 0, uap->amode)); 1948 } 1949 1950 #ifndef _SYS_SYSPROTO_H_ 1951 struct faccessat_args { 1952 int dirfd; 1953 char *path; 1954 int amode; 1955 int flag; 1956 } 1957 #endif 1958 int 1959 sys_faccessat(struct thread *td, struct faccessat_args *uap) 1960 { 1961 1962 return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, 1963 uap->amode)); 1964 } 1965 1966 int 1967 kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 1968 int flag, int amode) 1969 { 1970 struct ucred *cred, *usecred; 1971 struct vnode *vp; 1972 struct nameidata nd; 1973 cap_rights_t rights; 1974 int error; 1975 1976 if (flag & ~AT_EACCESS) 1977 return (EINVAL); 1978 if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) 1979 return (EINVAL); 1980 1981 /* 1982 * Create and modify a temporary credential instead of one that 1983 * is potentially shared (if we need one). 1984 */ 1985 cred = td->td_ucred; 1986 if ((flag & AT_EACCESS) == 0 && 1987 ((cred->cr_uid != cred->cr_ruid || 1988 cred->cr_rgid != cred->cr_groups[0]))) { 1989 usecred = crdup(cred); 1990 usecred->cr_uid = cred->cr_ruid; 1991 usecred->cr_groups[0] = cred->cr_rgid; 1992 td->td_ucred = usecred; 1993 } else 1994 usecred = cred; 1995 AUDIT_ARG_VALUE(amode); 1996 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | 1997 AUDITVNODE1, pathseg, path, fd, cap_rights_init(&rights, CAP_FSTAT), 1998 td); 1999 if ((error = namei(&nd)) != 0) 2000 goto out; 2001 vp = nd.ni_vp; 2002 2003 error = vn_access(vp, amode, usecred, td); 2004 NDFREE(&nd, NDF_ONLY_PNBUF); 2005 vput(vp); 2006 out: 2007 if (usecred != cred) { 2008 td->td_ucred = cred; 2009 crfree(usecred); 2010 } 2011 return (error); 2012 } 2013 2014 /* 2015 * Check access permissions using "effective" credentials. 2016 */ 2017 #ifndef _SYS_SYSPROTO_H_ 2018 struct eaccess_args { 2019 char *path; 2020 int amode; 2021 }; 2022 #endif 2023 int 2024 sys_eaccess(struct thread *td, struct eaccess_args *uap) 2025 { 2026 2027 return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2028 AT_EACCESS, uap->amode)); 2029 } 2030 2031 #if defined(COMPAT_43) 2032 /* 2033 * Get file status; this version follows links. 2034 */ 2035 #ifndef _SYS_SYSPROTO_H_ 2036 struct ostat_args { 2037 char *path; 2038 struct ostat *ub; 2039 }; 2040 #endif 2041 int 2042 ostat(struct thread *td, struct ostat_args *uap) 2043 { 2044 struct stat sb; 2045 struct ostat osb; 2046 int error; 2047 2048 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2049 &sb, NULL); 2050 if (error != 0) 2051 return (error); 2052 cvtstat(&sb, &osb); 2053 return (copyout(&osb, uap->ub, sizeof (osb))); 2054 } 2055 2056 /* 2057 * Get file status; this version does not follow links. 2058 */ 2059 #ifndef _SYS_SYSPROTO_H_ 2060 struct olstat_args { 2061 char *path; 2062 struct ostat *ub; 2063 }; 2064 #endif 2065 int 2066 olstat(struct thread *td, struct olstat_args *uap) 2067 { 2068 struct stat sb; 2069 struct ostat osb; 2070 int error; 2071 2072 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2073 UIO_USERSPACE, &sb, NULL); 2074 if (error != 0) 2075 return (error); 2076 cvtstat(&sb, &osb); 2077 return (copyout(&osb, uap->ub, sizeof (osb))); 2078 } 2079 2080 /* 2081 * Convert from an old to a new stat structure. 2082 */ 2083 void 2084 cvtstat(struct stat *st, struct ostat *ost) 2085 { 2086 2087 bzero(ost, sizeof(*ost)); 2088 ost->st_dev = st->st_dev; 2089 ost->st_ino = st->st_ino; 2090 ost->st_mode = st->st_mode; 2091 ost->st_nlink = st->st_nlink; 2092 ost->st_uid = st->st_uid; 2093 ost->st_gid = st->st_gid; 2094 ost->st_rdev = st->st_rdev; 2095 if (st->st_size < (quad_t)1 << 32) 2096 ost->st_size = st->st_size; 2097 else 2098 ost->st_size = -2; 2099 ost->st_atim = st->st_atim; 2100 ost->st_mtim = st->st_mtim; 2101 ost->st_ctim = st->st_ctim; 2102 ost->st_blksize = st->st_blksize; 2103 ost->st_blocks = st->st_blocks; 2104 ost->st_flags = st->st_flags; 2105 ost->st_gen = st->st_gen; 2106 } 2107 #endif /* COMPAT_43 */ 2108 2109 #if defined(COMPAT_FREEBSD11) 2110 void 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; /* truncate */ 2116 ost->st_mode = st->st_mode; 2117 ost->st_nlink = st->st_nlink; /* truncate */ 2118 ost->st_uid = st->st_uid; 2119 ost->st_gid = st->st_gid; 2120 ost->st_rdev = st->st_rdev; 2121 ost->st_atim = st->st_atim; 2122 ost->st_mtim = st->st_mtim; 2123 ost->st_ctim = st->st_ctim; 2124 ost->st_size = st->st_size; 2125 ost->st_blocks = st->st_blocks; 2126 ost->st_blksize = st->st_blksize; 2127 ost->st_flags = st->st_flags; 2128 ost->st_gen = st->st_gen; 2129 ost->st_lspare = 0; 2130 ost->st_birthtim = st->st_birthtim; 2131 bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), 2132 sizeof(*ost) - offsetof(struct freebsd11_stat, 2133 st_birthtim) - sizeof(ost->st_birthtim)); 2134 } 2135 2136 int 2137 freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) 2138 { 2139 struct stat sb; 2140 struct freebsd11_stat osb; 2141 int error; 2142 2143 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2144 &sb, NULL); 2145 if (error != 0) 2146 return (error); 2147 freebsd11_cvtstat(&sb, &osb); 2148 error = copyout(&osb, uap->ub, sizeof(osb)); 2149 return (error); 2150 } 2151 2152 int 2153 freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) 2154 { 2155 struct stat sb; 2156 struct freebsd11_stat osb; 2157 int error; 2158 2159 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2160 UIO_USERSPACE, &sb, NULL); 2161 if (error != 0) 2162 return (error); 2163 freebsd11_cvtstat(&sb, &osb); 2164 error = copyout(&osb, uap->ub, sizeof(osb)); 2165 return (error); 2166 } 2167 2168 int 2169 freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) 2170 { 2171 struct fhandle fh; 2172 struct stat sb; 2173 struct freebsd11_stat osb; 2174 int error; 2175 2176 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 2177 if (error != 0) 2178 return (error); 2179 error = kern_fhstat(td, fh, &sb); 2180 if (error != 0) 2181 return (error); 2182 freebsd11_cvtstat(&sb, &osb); 2183 error = copyout(&osb, uap->sb, sizeof(osb)); 2184 return (error); 2185 } 2186 2187 int 2188 freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) 2189 { 2190 struct stat sb; 2191 struct freebsd11_stat osb; 2192 int error; 2193 2194 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2195 UIO_USERSPACE, &sb, NULL); 2196 if (error != 0) 2197 return (error); 2198 freebsd11_cvtstat(&sb, &osb); 2199 error = copyout(&osb, uap->buf, sizeof(osb)); 2200 return (error); 2201 } 2202 #endif /* COMPAT_FREEBSD11 */ 2203 2204 /* 2205 * Get file status 2206 */ 2207 #ifndef _SYS_SYSPROTO_H_ 2208 struct fstatat_args { 2209 int fd; 2210 char *path; 2211 struct stat *buf; 2212 int flag; 2213 } 2214 #endif 2215 int 2216 sys_fstatat(struct thread *td, struct fstatat_args *uap) 2217 { 2218 struct stat sb; 2219 int error; 2220 2221 error = kern_statat(td, uap->flag, uap->fd, uap->path, 2222 UIO_USERSPACE, &sb, NULL); 2223 if (error == 0) 2224 error = copyout(&sb, uap->buf, sizeof (sb)); 2225 return (error); 2226 } 2227 2228 int 2229 kern_statat(struct thread *td, int flag, int fd, char *path, 2230 enum uio_seg pathseg, struct stat *sbp, 2231 void (*hook)(struct vnode *vp, struct stat *sbp)) 2232 { 2233 struct nameidata nd; 2234 struct stat sb; 2235 cap_rights_t rights; 2236 int error; 2237 2238 if (flag & ~AT_SYMLINK_NOFOLLOW) 2239 return (EINVAL); 2240 2241 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 2242 FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd, 2243 cap_rights_init(&rights, CAP_FSTAT), td); 2244 2245 if ((error = namei(&nd)) != 0) 2246 return (error); 2247 error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); 2248 if (error == 0) { 2249 SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode); 2250 if (S_ISREG(sb.st_mode)) 2251 SDT_PROBE2(vfs, , stat, reg, path, pathseg); 2252 if (__predict_false(hook != NULL)) 2253 hook(nd.ni_vp, &sb); 2254 } 2255 NDFREE(&nd, NDF_ONLY_PNBUF); 2256 vput(nd.ni_vp); 2257 if (error != 0) 2258 return (error); 2259 #ifdef __STAT_TIME_T_EXT 2260 sb.st_atim_ext = 0; 2261 sb.st_mtim_ext = 0; 2262 sb.st_ctim_ext = 0; 2263 sb.st_btim_ext = 0; 2264 #endif 2265 *sbp = sb; 2266 #ifdef KTRACE 2267 if (KTRPOINT(td, KTR_STRUCT)) 2268 ktrstat(&sb); 2269 #endif 2270 return (0); 2271 } 2272 2273 #if defined(COMPAT_FREEBSD11) 2274 /* 2275 * Implementation of the NetBSD [l]stat() functions. 2276 */ 2277 void 2278 freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) 2279 { 2280 2281 bzero(nsb, sizeof(*nsb)); 2282 nsb->st_dev = sb->st_dev; 2283 nsb->st_ino = sb->st_ino; 2284 nsb->st_mode = sb->st_mode; 2285 nsb->st_nlink = sb->st_nlink; 2286 nsb->st_uid = sb->st_uid; 2287 nsb->st_gid = sb->st_gid; 2288 nsb->st_rdev = sb->st_rdev; 2289 nsb->st_atim = sb->st_atim; 2290 nsb->st_mtim = sb->st_mtim; 2291 nsb->st_ctim = sb->st_ctim; 2292 nsb->st_size = sb->st_size; 2293 nsb->st_blocks = sb->st_blocks; 2294 nsb->st_blksize = sb->st_blksize; 2295 nsb->st_flags = sb->st_flags; 2296 nsb->st_gen = sb->st_gen; 2297 nsb->st_birthtim = sb->st_birthtim; 2298 } 2299 2300 #ifndef _SYS_SYSPROTO_H_ 2301 struct freebsd11_nstat_args { 2302 char *path; 2303 struct nstat *ub; 2304 }; 2305 #endif 2306 int 2307 freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) 2308 { 2309 struct stat sb; 2310 struct nstat nsb; 2311 int error; 2312 2313 error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, 2314 &sb, NULL); 2315 if (error != 0) 2316 return (error); 2317 freebsd11_cvtnstat(&sb, &nsb); 2318 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2319 } 2320 2321 /* 2322 * NetBSD lstat. Get file status; this version does not follow links. 2323 */ 2324 #ifndef _SYS_SYSPROTO_H_ 2325 struct freebsd11_nlstat_args { 2326 char *path; 2327 struct nstat *ub; 2328 }; 2329 #endif 2330 int 2331 freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) 2332 { 2333 struct stat sb; 2334 struct nstat nsb; 2335 int error; 2336 2337 error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, 2338 UIO_USERSPACE, &sb, NULL); 2339 if (error != 0) 2340 return (error); 2341 freebsd11_cvtnstat(&sb, &nsb); 2342 return (copyout(&nsb, uap->ub, sizeof (nsb))); 2343 } 2344 #endif /* COMPAT_FREEBSD11 */ 2345 2346 /* 2347 * Get configurable pathname variables. 2348 */ 2349 #ifndef _SYS_SYSPROTO_H_ 2350 struct pathconf_args { 2351 char *path; 2352 int name; 2353 }; 2354 #endif 2355 int 2356 sys_pathconf(struct thread *td, struct pathconf_args *uap) 2357 { 2358 2359 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW)); 2360 } 2361 2362 #ifndef _SYS_SYSPROTO_H_ 2363 struct lpathconf_args { 2364 char *path; 2365 int name; 2366 }; 2367 #endif 2368 int 2369 sys_lpathconf(struct thread *td, struct lpathconf_args *uap) 2370 { 2371 2372 return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, 2373 NOFOLLOW)); 2374 } 2375 2376 int 2377 kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name, 2378 u_long flags) 2379 { 2380 struct nameidata nd; 2381 int error; 2382 2383 NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, 2384 pathseg, path, td); 2385 if ((error = namei(&nd)) != 0) 2386 return (error); 2387 NDFREE(&nd, NDF_ONLY_PNBUF); 2388 2389 error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval); 2390 vput(nd.ni_vp); 2391 return (error); 2392 } 2393 2394 /* 2395 * Return target name of a symbolic link. 2396 */ 2397 #ifndef _SYS_SYSPROTO_H_ 2398 struct readlink_args { 2399 char *path; 2400 char *buf; 2401 size_t count; 2402 }; 2403 #endif 2404 int 2405 sys_readlink(struct thread *td, struct readlink_args *uap) 2406 { 2407 2408 return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2409 uap->buf, UIO_USERSPACE, uap->count)); 2410 } 2411 #ifndef _SYS_SYSPROTO_H_ 2412 struct readlinkat_args { 2413 int fd; 2414 char *path; 2415 char *buf; 2416 size_t bufsize; 2417 }; 2418 #endif 2419 int 2420 sys_readlinkat(struct thread *td, struct readlinkat_args *uap) 2421 { 2422 2423 return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, 2424 uap->buf, UIO_USERSPACE, uap->bufsize)); 2425 } 2426 2427 int 2428 kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2429 char *buf, enum uio_seg bufseg, size_t count) 2430 { 2431 struct vnode *vp; 2432 struct iovec aiov; 2433 struct uio auio; 2434 struct nameidata nd; 2435 int error; 2436 2437 if (count > IOSIZE_MAX) 2438 return (EINVAL); 2439 2440 NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, 2441 pathseg, path, fd, td); 2442 2443 if ((error = namei(&nd)) != 0) 2444 return (error); 2445 NDFREE(&nd, NDF_ONLY_PNBUF); 2446 vp = nd.ni_vp; 2447 #ifdef MAC 2448 error = mac_vnode_check_readlink(td->td_ucred, vp); 2449 if (error != 0) { 2450 vput(vp); 2451 return (error); 2452 } 2453 #endif 2454 if (vp->v_type != VLNK) 2455 error = EINVAL; 2456 else { 2457 aiov.iov_base = buf; 2458 aiov.iov_len = count; 2459 auio.uio_iov = &aiov; 2460 auio.uio_iovcnt = 1; 2461 auio.uio_offset = 0; 2462 auio.uio_rw = UIO_READ; 2463 auio.uio_segflg = bufseg; 2464 auio.uio_td = td; 2465 auio.uio_resid = count; 2466 error = VOP_READLINK(vp, &auio, td->td_ucred); 2467 td->td_retval[0] = count - auio.uio_resid; 2468 } 2469 vput(vp); 2470 return (error); 2471 } 2472 2473 /* 2474 * Common implementation code for chflags() and fchflags(). 2475 */ 2476 static int 2477 setfflags(struct thread *td, struct vnode *vp, u_long flags) 2478 { 2479 struct mount *mp; 2480 struct vattr vattr; 2481 int error; 2482 2483 /* We can't support the value matching VNOVAL. */ 2484 if (flags == VNOVAL) 2485 return (EOPNOTSUPP); 2486 2487 /* 2488 * Prevent non-root users from setting flags on devices. When 2489 * a device is reused, users can retain ownership of the device 2490 * if they are allowed to set flags and programs assume that 2491 * chown can't fail when done as root. 2492 */ 2493 if (vp->v_type == VCHR || vp->v_type == VBLK) { 2494 error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); 2495 if (error != 0) 2496 return (error); 2497 } 2498 2499 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2500 return (error); 2501 VATTR_NULL(&vattr); 2502 vattr.va_flags = flags; 2503 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2504 #ifdef MAC 2505 error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); 2506 if (error == 0) 2507 #endif 2508 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2509 VOP_UNLOCK(vp, 0); 2510 vn_finished_write(mp); 2511 return (error); 2512 } 2513 2514 /* 2515 * Change flags of a file given a path name. 2516 */ 2517 #ifndef _SYS_SYSPROTO_H_ 2518 struct chflags_args { 2519 const char *path; 2520 u_long flags; 2521 }; 2522 #endif 2523 int 2524 sys_chflags(struct thread *td, struct chflags_args *uap) 2525 { 2526 2527 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2528 uap->flags, 0)); 2529 } 2530 2531 #ifndef _SYS_SYSPROTO_H_ 2532 struct chflagsat_args { 2533 int fd; 2534 const char *path; 2535 u_long flags; 2536 int atflag; 2537 } 2538 #endif 2539 int 2540 sys_chflagsat(struct thread *td, struct chflagsat_args *uap) 2541 { 2542 int fd = uap->fd; 2543 const char *path = uap->path; 2544 u_long flags = uap->flags; 2545 int atflag = uap->atflag; 2546 2547 if (atflag & ~AT_SYMLINK_NOFOLLOW) 2548 return (EINVAL); 2549 2550 return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag)); 2551 } 2552 2553 /* 2554 * Same as chflags() but doesn't follow symlinks. 2555 */ 2556 #ifndef _SYS_SYSPROTO_H_ 2557 struct lchflags_args { 2558 const char *path; 2559 u_long flags; 2560 }; 2561 #endif 2562 int 2563 sys_lchflags(struct thread *td, struct lchflags_args *uap) 2564 { 2565 2566 return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2567 uap->flags, AT_SYMLINK_NOFOLLOW)); 2568 } 2569 2570 static int 2571 kern_chflagsat(struct thread *td, int fd, const char *path, 2572 enum uio_seg pathseg, u_long flags, int atflag) 2573 { 2574 struct nameidata nd; 2575 cap_rights_t rights; 2576 int error, follow; 2577 2578 AUDIT_ARG_FFLAGS(flags); 2579 follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2580 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2581 cap_rights_init(&rights, CAP_FCHFLAGS), td); 2582 if ((error = namei(&nd)) != 0) 2583 return (error); 2584 NDFREE(&nd, NDF_ONLY_PNBUF); 2585 error = setfflags(td, nd.ni_vp, flags); 2586 vrele(nd.ni_vp); 2587 return (error); 2588 } 2589 2590 /* 2591 * Change flags of a file given a file descriptor. 2592 */ 2593 #ifndef _SYS_SYSPROTO_H_ 2594 struct fchflags_args { 2595 int fd; 2596 u_long flags; 2597 }; 2598 #endif 2599 int 2600 sys_fchflags(struct thread *td, struct fchflags_args *uap) 2601 { 2602 struct file *fp; 2603 cap_rights_t rights; 2604 int error; 2605 2606 AUDIT_ARG_FD(uap->fd); 2607 AUDIT_ARG_FFLAGS(uap->flags); 2608 error = getvnode(td, uap->fd, cap_rights_init(&rights, CAP_FCHFLAGS), 2609 &fp); 2610 if (error != 0) 2611 return (error); 2612 #ifdef AUDIT 2613 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 2614 AUDIT_ARG_VNODE1(fp->f_vnode); 2615 VOP_UNLOCK(fp->f_vnode, 0); 2616 #endif 2617 error = setfflags(td, fp->f_vnode, uap->flags); 2618 fdrop(fp, td); 2619 return (error); 2620 } 2621 2622 /* 2623 * Common implementation code for chmod(), lchmod() and fchmod(). 2624 */ 2625 int 2626 setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) 2627 { 2628 struct mount *mp; 2629 struct vattr vattr; 2630 int error; 2631 2632 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2633 return (error); 2634 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2635 VATTR_NULL(&vattr); 2636 vattr.va_mode = mode & ALLPERMS; 2637 #ifdef MAC 2638 error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); 2639 if (error == 0) 2640 #endif 2641 error = VOP_SETATTR(vp, &vattr, cred); 2642 VOP_UNLOCK(vp, 0); 2643 vn_finished_write(mp); 2644 return (error); 2645 } 2646 2647 /* 2648 * Change mode of a file given path name. 2649 */ 2650 #ifndef _SYS_SYSPROTO_H_ 2651 struct chmod_args { 2652 char *path; 2653 int mode; 2654 }; 2655 #endif 2656 int 2657 sys_chmod(struct thread *td, struct chmod_args *uap) 2658 { 2659 2660 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2661 uap->mode, 0)); 2662 } 2663 2664 #ifndef _SYS_SYSPROTO_H_ 2665 struct fchmodat_args { 2666 int dirfd; 2667 char *path; 2668 mode_t mode; 2669 int flag; 2670 } 2671 #endif 2672 int 2673 sys_fchmodat(struct thread *td, struct fchmodat_args *uap) 2674 { 2675 int flag = uap->flag; 2676 int fd = uap->fd; 2677 char *path = uap->path; 2678 mode_t mode = uap->mode; 2679 2680 if (flag & ~AT_SYMLINK_NOFOLLOW) 2681 return (EINVAL); 2682 2683 return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag)); 2684 } 2685 2686 /* 2687 * Change mode of a file given path name (don't follow links.) 2688 */ 2689 #ifndef _SYS_SYSPROTO_H_ 2690 struct lchmod_args { 2691 char *path; 2692 int mode; 2693 }; 2694 #endif 2695 int 2696 sys_lchmod(struct thread *td, struct lchmod_args *uap) 2697 { 2698 2699 return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2700 uap->mode, AT_SYMLINK_NOFOLLOW)); 2701 } 2702 2703 int 2704 kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2705 mode_t mode, int flag) 2706 { 2707 struct nameidata nd; 2708 cap_rights_t rights; 2709 int error, follow; 2710 2711 AUDIT_ARG_MODE(mode); 2712 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2713 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2714 cap_rights_init(&rights, CAP_FCHMOD), td); 2715 if ((error = namei(&nd)) != 0) 2716 return (error); 2717 NDFREE(&nd, NDF_ONLY_PNBUF); 2718 error = setfmode(td, td->td_ucred, nd.ni_vp, mode); 2719 vrele(nd.ni_vp); 2720 return (error); 2721 } 2722 2723 /* 2724 * Change mode of a file given a file descriptor. 2725 */ 2726 #ifndef _SYS_SYSPROTO_H_ 2727 struct fchmod_args { 2728 int fd; 2729 int mode; 2730 }; 2731 #endif 2732 int 2733 sys_fchmod(struct thread *td, struct fchmod_args *uap) 2734 { 2735 struct file *fp; 2736 cap_rights_t rights; 2737 int error; 2738 2739 AUDIT_ARG_FD(uap->fd); 2740 AUDIT_ARG_MODE(uap->mode); 2741 2742 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHMOD), &fp); 2743 if (error != 0) 2744 return (error); 2745 error = fo_chmod(fp, uap->mode, td->td_ucred, td); 2746 fdrop(fp, td); 2747 return (error); 2748 } 2749 2750 /* 2751 * Common implementation for chown(), lchown(), and fchown() 2752 */ 2753 int 2754 setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, 2755 gid_t gid) 2756 { 2757 struct mount *mp; 2758 struct vattr vattr; 2759 int error; 2760 2761 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2762 return (error); 2763 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2764 VATTR_NULL(&vattr); 2765 vattr.va_uid = uid; 2766 vattr.va_gid = gid; 2767 #ifdef MAC 2768 error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, 2769 vattr.va_gid); 2770 if (error == 0) 2771 #endif 2772 error = VOP_SETATTR(vp, &vattr, cred); 2773 VOP_UNLOCK(vp, 0); 2774 vn_finished_write(mp); 2775 return (error); 2776 } 2777 2778 /* 2779 * Set ownership given a path name. 2780 */ 2781 #ifndef _SYS_SYSPROTO_H_ 2782 struct chown_args { 2783 char *path; 2784 int uid; 2785 int gid; 2786 }; 2787 #endif 2788 int 2789 sys_chown(struct thread *td, struct chown_args *uap) 2790 { 2791 2792 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, 2793 uap->gid, 0)); 2794 } 2795 2796 #ifndef _SYS_SYSPROTO_H_ 2797 struct fchownat_args { 2798 int fd; 2799 const char * path; 2800 uid_t uid; 2801 gid_t gid; 2802 int flag; 2803 }; 2804 #endif 2805 int 2806 sys_fchownat(struct thread *td, struct fchownat_args *uap) 2807 { 2808 int flag; 2809 2810 flag = uap->flag; 2811 if (flag & ~AT_SYMLINK_NOFOLLOW) 2812 return (EINVAL); 2813 2814 return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, 2815 uap->gid, uap->flag)); 2816 } 2817 2818 int 2819 kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 2820 int uid, int gid, int flag) 2821 { 2822 struct nameidata nd; 2823 cap_rights_t rights; 2824 int error, follow; 2825 2826 AUDIT_ARG_OWNER(uid, gid); 2827 follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 2828 NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, 2829 cap_rights_init(&rights, CAP_FCHOWN), td); 2830 2831 if ((error = namei(&nd)) != 0) 2832 return (error); 2833 NDFREE(&nd, NDF_ONLY_PNBUF); 2834 error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); 2835 vrele(nd.ni_vp); 2836 return (error); 2837 } 2838 2839 /* 2840 * Set ownership given a path name, do not cross symlinks. 2841 */ 2842 #ifndef _SYS_SYSPROTO_H_ 2843 struct lchown_args { 2844 char *path; 2845 int uid; 2846 int gid; 2847 }; 2848 #endif 2849 int 2850 sys_lchown(struct thread *td, struct lchown_args *uap) 2851 { 2852 2853 return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 2854 uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); 2855 } 2856 2857 /* 2858 * Set ownership given a file descriptor. 2859 */ 2860 #ifndef _SYS_SYSPROTO_H_ 2861 struct fchown_args { 2862 int fd; 2863 int uid; 2864 int gid; 2865 }; 2866 #endif 2867 int 2868 sys_fchown(struct thread *td, struct fchown_args *uap) 2869 { 2870 struct file *fp; 2871 cap_rights_t rights; 2872 int error; 2873 2874 AUDIT_ARG_FD(uap->fd); 2875 AUDIT_ARG_OWNER(uap->uid, uap->gid); 2876 error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FCHOWN), &fp); 2877 if (error != 0) 2878 return (error); 2879 error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); 2880 fdrop(fp, td); 2881 return (error); 2882 } 2883 2884 /* 2885 * Common implementation code for utimes(), lutimes(), and futimes(). 2886 */ 2887 static int 2888 getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, 2889 struct timespec *tsp) 2890 { 2891 struct timeval tv[2]; 2892 const struct timeval *tvp; 2893 int error; 2894 2895 if (usrtvp == NULL) { 2896 vfs_timestamp(&tsp[0]); 2897 tsp[1] = tsp[0]; 2898 } else { 2899 if (tvpseg == UIO_SYSSPACE) { 2900 tvp = usrtvp; 2901 } else { 2902 if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) 2903 return (error); 2904 tvp = tv; 2905 } 2906 2907 if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || 2908 tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) 2909 return (EINVAL); 2910 TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); 2911 TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); 2912 } 2913 return (0); 2914 } 2915 2916 /* 2917 * Common implementation code for futimens(), utimensat(). 2918 */ 2919 #define UTIMENS_NULL 0x1 2920 #define UTIMENS_EXIT 0x2 2921 static int 2922 getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, 2923 struct timespec *tsp, int *retflags) 2924 { 2925 struct timespec tsnow; 2926 int error; 2927 2928 vfs_timestamp(&tsnow); 2929 *retflags = 0; 2930 if (usrtsp == NULL) { 2931 tsp[0] = tsnow; 2932 tsp[1] = tsnow; 2933 *retflags |= UTIMENS_NULL; 2934 return (0); 2935 } 2936 if (tspseg == UIO_SYSSPACE) { 2937 tsp[0] = usrtsp[0]; 2938 tsp[1] = usrtsp[1]; 2939 } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) 2940 return (error); 2941 if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) 2942 *retflags |= UTIMENS_EXIT; 2943 if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) 2944 *retflags |= UTIMENS_NULL; 2945 if (tsp[0].tv_nsec == UTIME_OMIT) 2946 tsp[0].tv_sec = VNOVAL; 2947 else if (tsp[0].tv_nsec == UTIME_NOW) 2948 tsp[0] = tsnow; 2949 else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) 2950 return (EINVAL); 2951 if (tsp[1].tv_nsec == UTIME_OMIT) 2952 tsp[1].tv_sec = VNOVAL; 2953 else if (tsp[1].tv_nsec == UTIME_NOW) 2954 tsp[1] = tsnow; 2955 else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) 2956 return (EINVAL); 2957 2958 return (0); 2959 } 2960 2961 /* 2962 * Common implementation code for utimes(), lutimes(), futimes(), futimens(), 2963 * and utimensat(). 2964 */ 2965 static int 2966 setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, 2967 int numtimes, int nullflag) 2968 { 2969 struct mount *mp; 2970 struct vattr vattr; 2971 int error, setbirthtime; 2972 2973 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) 2974 return (error); 2975 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2976 setbirthtime = 0; 2977 if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && 2978 timespeccmp(&ts[1], &vattr.va_birthtime, < )) 2979 setbirthtime = 1; 2980 VATTR_NULL(&vattr); 2981 vattr.va_atime = ts[0]; 2982 vattr.va_mtime = ts[1]; 2983 if (setbirthtime) 2984 vattr.va_birthtime = ts[1]; 2985 if (numtimes > 2) 2986 vattr.va_birthtime = ts[2]; 2987 if (nullflag) 2988 vattr.va_vaflags |= VA_UTIMES_NULL; 2989 #ifdef MAC 2990 error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, 2991 vattr.va_mtime); 2992 #endif 2993 if (error == 0) 2994 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 2995 VOP_UNLOCK(vp, 0); 2996 vn_finished_write(mp); 2997 return (error); 2998 } 2999 3000 /* 3001 * Set the access and modification times of a file. 3002 */ 3003 #ifndef _SYS_SYSPROTO_H_ 3004 struct utimes_args { 3005 char *path; 3006 struct timeval *tptr; 3007 }; 3008 #endif 3009 int 3010 sys_utimes(struct thread *td, struct utimes_args *uap) 3011 { 3012 3013 return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3014 uap->tptr, UIO_USERSPACE)); 3015 } 3016 3017 #ifndef _SYS_SYSPROTO_H_ 3018 struct futimesat_args { 3019 int fd; 3020 const char * path; 3021 const struct timeval * times; 3022 }; 3023 #endif 3024 int 3025 sys_futimesat(struct thread *td, struct futimesat_args *uap) 3026 { 3027 3028 return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, 3029 uap->times, UIO_USERSPACE)); 3030 } 3031 3032 int 3033 kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3034 struct timeval *tptr, enum uio_seg tptrseg) 3035 { 3036 struct nameidata nd; 3037 struct timespec ts[2]; 3038 cap_rights_t rights; 3039 int error; 3040 3041 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3042 return (error); 3043 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, 3044 cap_rights_init(&rights, CAP_FUTIMES), td); 3045 3046 if ((error = namei(&nd)) != 0) 3047 return (error); 3048 NDFREE(&nd, NDF_ONLY_PNBUF); 3049 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3050 vrele(nd.ni_vp); 3051 return (error); 3052 } 3053 3054 /* 3055 * Set the access and modification times of a file. 3056 */ 3057 #ifndef _SYS_SYSPROTO_H_ 3058 struct lutimes_args { 3059 char *path; 3060 struct timeval *tptr; 3061 }; 3062 #endif 3063 int 3064 sys_lutimes(struct thread *td, struct lutimes_args *uap) 3065 { 3066 3067 return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, 3068 UIO_USERSPACE)); 3069 } 3070 3071 int 3072 kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, 3073 struct timeval *tptr, enum uio_seg tptrseg) 3074 { 3075 struct timespec ts[2]; 3076 struct nameidata nd; 3077 int error; 3078 3079 if ((error = getutimes(tptr, tptrseg, ts)) != 0) 3080 return (error); 3081 NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); 3082 if ((error = namei(&nd)) != 0) 3083 return (error); 3084 NDFREE(&nd, NDF_ONLY_PNBUF); 3085 error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); 3086 vrele(nd.ni_vp); 3087 return (error); 3088 } 3089 3090 /* 3091 * Set the access and modification times of a file. 3092 */ 3093 #ifndef _SYS_SYSPROTO_H_ 3094 struct futimes_args { 3095 int fd; 3096 struct timeval *tptr; 3097 }; 3098 #endif 3099 int 3100 sys_futimes(struct thread *td, struct futimes_args *uap) 3101 { 3102 3103 return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); 3104 } 3105 3106 int 3107 kern_futimes(struct thread *td, int fd, struct timeval *tptr, 3108 enum uio_seg tptrseg) 3109 { 3110 struct timespec ts[2]; 3111 struct file *fp; 3112 cap_rights_t rights; 3113 int error; 3114 3115 AUDIT_ARG_FD(fd); 3116 error = getutimes(tptr, tptrseg, ts); 3117 if (error != 0) 3118 return (error); 3119 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FUTIMES), &fp); 3120 if (error != 0) 3121 return (error); 3122 #ifdef AUDIT 3123 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3124 AUDIT_ARG_VNODE1(fp->f_vnode); 3125 VOP_UNLOCK(fp->f_vnode, 0); 3126 #endif 3127 error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); 3128 fdrop(fp, td); 3129 return (error); 3130 } 3131 3132 int 3133 sys_futimens(struct thread *td, struct futimens_args *uap) 3134 { 3135 3136 return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); 3137 } 3138 3139 int 3140 kern_futimens(struct thread *td, int fd, struct timespec *tptr, 3141 enum uio_seg tptrseg) 3142 { 3143 struct timespec ts[2]; 3144 struct file *fp; 3145 cap_rights_t rights; 3146 int error, flags; 3147 3148 AUDIT_ARG_FD(fd); 3149 error = getutimens(tptr, tptrseg, ts, &flags); 3150 if (error != 0) 3151 return (error); 3152 if (flags & UTIMENS_EXIT) 3153 return (0); 3154 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FUTIMES), &fp); 3155 if (error != 0) 3156 return (error); 3157 #ifdef AUDIT 3158 vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); 3159 AUDIT_ARG_VNODE1(fp->f_vnode); 3160 VOP_UNLOCK(fp->f_vnode, 0); 3161 #endif 3162 error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); 3163 fdrop(fp, td); 3164 return (error); 3165 } 3166 3167 int 3168 sys_utimensat(struct thread *td, struct utimensat_args *uap) 3169 { 3170 3171 return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, 3172 uap->times, UIO_USERSPACE, uap->flag)); 3173 } 3174 3175 int 3176 kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg, 3177 struct timespec *tptr, enum uio_seg tptrseg, int flag) 3178 { 3179 struct nameidata nd; 3180 struct timespec ts[2]; 3181 cap_rights_t rights; 3182 int error, flags; 3183 3184 if (flag & ~AT_SYMLINK_NOFOLLOW) 3185 return (EINVAL); 3186 3187 if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) 3188 return (error); 3189 NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : 3190 FOLLOW) | AUDITVNODE1, pathseg, path, fd, 3191 cap_rights_init(&rights, CAP_FUTIMES), td); 3192 if ((error = namei(&nd)) != 0) 3193 return (error); 3194 /* 3195 * We are allowed to call namei() regardless of 2xUTIME_OMIT. 3196 * POSIX states: 3197 * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." 3198 * "Search permission is denied by a component of the path prefix." 3199 */ 3200 NDFREE(&nd, NDF_ONLY_PNBUF); 3201 if ((flags & UTIMENS_EXIT) == 0) 3202 error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); 3203 vrele(nd.ni_vp); 3204 return (error); 3205 } 3206 3207 /* 3208 * Truncate a file given its path name. 3209 */ 3210 #ifndef _SYS_SYSPROTO_H_ 3211 struct truncate_args { 3212 char *path; 3213 int pad; 3214 off_t length; 3215 }; 3216 #endif 3217 int 3218 sys_truncate(struct thread *td, struct truncate_args *uap) 3219 { 3220 3221 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3222 } 3223 3224 int 3225 kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) 3226 { 3227 struct mount *mp; 3228 struct vnode *vp; 3229 void *rl_cookie; 3230 struct vattr vattr; 3231 struct nameidata nd; 3232 int error; 3233 3234 if (length < 0) 3235 return(EINVAL); 3236 NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); 3237 if ((error = namei(&nd)) != 0) 3238 return (error); 3239 vp = nd.ni_vp; 3240 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); 3241 if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { 3242 vn_rangelock_unlock(vp, rl_cookie); 3243 vrele(vp); 3244 return (error); 3245 } 3246 NDFREE(&nd, NDF_ONLY_PNBUF); 3247 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3248 if (vp->v_type == VDIR) 3249 error = EISDIR; 3250 #ifdef MAC 3251 else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { 3252 } 3253 #endif 3254 else if ((error = vn_writechk(vp)) == 0 && 3255 (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { 3256 VATTR_NULL(&vattr); 3257 vattr.va_size = length; 3258 error = VOP_SETATTR(vp, &vattr, td->td_ucred); 3259 } 3260 VOP_UNLOCK(vp, 0); 3261 vn_finished_write(mp); 3262 vn_rangelock_unlock(vp, rl_cookie); 3263 vrele(vp); 3264 return (error); 3265 } 3266 3267 #if defined(COMPAT_43) 3268 /* 3269 * Truncate a file given its path name. 3270 */ 3271 #ifndef _SYS_SYSPROTO_H_ 3272 struct otruncate_args { 3273 char *path; 3274 long length; 3275 }; 3276 #endif 3277 int 3278 otruncate(struct thread *td, struct otruncate_args *uap) 3279 { 3280 3281 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3282 } 3283 #endif /* COMPAT_43 */ 3284 3285 #if defined(COMPAT_FREEBSD6) 3286 /* Versions with the pad argument */ 3287 int 3288 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) 3289 { 3290 3291 return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); 3292 } 3293 3294 int 3295 freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) 3296 { 3297 3298 return (kern_ftruncate(td, uap->fd, uap->length)); 3299 } 3300 #endif 3301 3302 int 3303 kern_fsync(struct thread *td, int fd, bool fullsync) 3304 { 3305 struct vnode *vp; 3306 struct mount *mp; 3307 struct file *fp; 3308 cap_rights_t rights; 3309 int error, lock_flags; 3310 3311 AUDIT_ARG_FD(fd); 3312 error = getvnode(td, fd, cap_rights_init(&rights, CAP_FSYNC), &fp); 3313 if (error != 0) 3314 return (error); 3315 vp = fp->f_vnode; 3316 #if 0 3317 if (!fullsync) 3318 /* XXXKIB: compete outstanding aio writes */; 3319 #endif 3320 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 3321 if (error != 0) 3322 goto drop; 3323 if (MNT_SHARED_WRITES(mp) || 3324 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { 3325 lock_flags = LK_SHARED; 3326 } else { 3327 lock_flags = LK_EXCLUSIVE; 3328 } 3329 vn_lock(vp, lock_flags | LK_RETRY); 3330 AUDIT_ARG_VNODE1(vp); 3331 if (vp->v_object != NULL) { 3332 VM_OBJECT_WLOCK(vp->v_object); 3333 vm_object_page_clean(vp->v_object, 0, 0, 0); 3334 VM_OBJECT_WUNLOCK(vp->v_object); 3335 } 3336 error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); 3337 VOP_UNLOCK(vp, 0); 3338 vn_finished_write(mp); 3339 drop: 3340 fdrop(fp, td); 3341 return (error); 3342 } 3343 3344 /* 3345 * Sync an open file. 3346 */ 3347 #ifndef _SYS_SYSPROTO_H_ 3348 struct fsync_args { 3349 int fd; 3350 }; 3351 #endif 3352 int 3353 sys_fsync(struct thread *td, struct fsync_args *uap) 3354 { 3355 3356 return (kern_fsync(td, uap->fd, true)); 3357 } 3358 3359 int 3360 sys_fdatasync(struct thread *td, struct fdatasync_args *uap) 3361 { 3362 3363 return (kern_fsync(td, uap->fd, false)); 3364 } 3365 3366 /* 3367 * Rename files. Source and destination must either both be directories, or 3368 * both not be directories. If target is a directory, it must be empty. 3369 */ 3370 #ifndef _SYS_SYSPROTO_H_ 3371 struct rename_args { 3372 char *from; 3373 char *to; 3374 }; 3375 #endif 3376 int 3377 sys_rename(struct thread *td, struct rename_args *uap) 3378 { 3379 3380 return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, 3381 uap->to, UIO_USERSPACE)); 3382 } 3383 3384 #ifndef _SYS_SYSPROTO_H_ 3385 struct renameat_args { 3386 int oldfd; 3387 char *old; 3388 int newfd; 3389 char *new; 3390 }; 3391 #endif 3392 int 3393 sys_renameat(struct thread *td, struct renameat_args *uap) 3394 { 3395 3396 return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, 3397 UIO_USERSPACE)); 3398 } 3399 3400 int 3401 kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new, 3402 enum uio_seg pathseg) 3403 { 3404 struct mount *mp = NULL; 3405 struct vnode *tvp, *fvp, *tdvp; 3406 struct nameidata fromnd, tond; 3407 cap_rights_t rights; 3408 int error; 3409 3410 again: 3411 bwillwrite(); 3412 #ifdef MAC 3413 NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | 3414 AUDITVNODE1, pathseg, old, oldfd, 3415 cap_rights_init(&rights, CAP_RENAMEAT_SOURCE), td); 3416 #else 3417 NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, 3418 pathseg, old, oldfd, 3419 cap_rights_init(&rights, CAP_RENAMEAT_SOURCE), td); 3420 #endif 3421 3422 if ((error = namei(&fromnd)) != 0) 3423 return (error); 3424 #ifdef MAC 3425 error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, 3426 fromnd.ni_vp, &fromnd.ni_cnd); 3427 VOP_UNLOCK(fromnd.ni_dvp, 0); 3428 if (fromnd.ni_dvp != fromnd.ni_vp) 3429 VOP_UNLOCK(fromnd.ni_vp, 0); 3430 #endif 3431 fvp = fromnd.ni_vp; 3432 NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | 3433 SAVESTART | AUDITVNODE2, pathseg, new, newfd, 3434 cap_rights_init(&rights, CAP_RENAMEAT_TARGET), td); 3435 if (fromnd.ni_vp->v_type == VDIR) 3436 tond.ni_cnd.cn_flags |= WILLBEDIR; 3437 if ((error = namei(&tond)) != 0) { 3438 /* Translate error code for rename("dir1", "dir2/."). */ 3439 if (error == EISDIR && fvp->v_type == VDIR) 3440 error = EINVAL; 3441 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3442 vrele(fromnd.ni_dvp); 3443 vrele(fvp); 3444 goto out1; 3445 } 3446 tdvp = tond.ni_dvp; 3447 tvp = tond.ni_vp; 3448 error = vn_start_write(fvp, &mp, V_NOWAIT); 3449 if (error != 0) { 3450 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3451 NDFREE(&tond, NDF_ONLY_PNBUF); 3452 if (tvp != NULL) 3453 vput(tvp); 3454 if (tdvp == tvp) 3455 vrele(tdvp); 3456 else 3457 vput(tdvp); 3458 vrele(fromnd.ni_dvp); 3459 vrele(fvp); 3460 vrele(tond.ni_startdir); 3461 if (fromnd.ni_startdir != NULL) 3462 vrele(fromnd.ni_startdir); 3463 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); 3464 if (error != 0) 3465 return (error); 3466 goto again; 3467 } 3468 if (tvp != NULL) { 3469 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3470 error = ENOTDIR; 3471 goto out; 3472 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3473 error = EISDIR; 3474 goto out; 3475 } 3476 #ifdef CAPABILITIES 3477 if (newfd != AT_FDCWD) { 3478 /* 3479 * If the target already exists we require CAP_UNLINKAT 3480 * from 'newfd'. 3481 */ 3482 error = cap_check(&tond.ni_filecaps.fc_rights, 3483 cap_rights_init(&rights, CAP_UNLINKAT)); 3484 if (error != 0) 3485 goto out; 3486 } 3487 #endif 3488 } 3489 if (fvp == tdvp) { 3490 error = EINVAL; 3491 goto out; 3492 } 3493 /* 3494 * If the source is the same as the destination (that is, if they 3495 * are links to the same vnode), then there is nothing to do. 3496 */ 3497 if (fvp == tvp) 3498 error = -1; 3499 #ifdef MAC 3500 else 3501 error = mac_vnode_check_rename_to(td->td_ucred, tdvp, 3502 tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); 3503 #endif 3504 out: 3505 if (error == 0) { 3506 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3507 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3508 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3509 NDFREE(&tond, NDF_ONLY_PNBUF); 3510 } else { 3511 NDFREE(&fromnd, NDF_ONLY_PNBUF); 3512 NDFREE(&tond, NDF_ONLY_PNBUF); 3513 if (tvp != NULL) 3514 vput(tvp); 3515 if (tdvp == tvp) 3516 vrele(tdvp); 3517 else 3518 vput(tdvp); 3519 vrele(fromnd.ni_dvp); 3520 vrele(fvp); 3521 } 3522 vrele(tond.ni_startdir); 3523 vn_finished_write(mp); 3524 out1: 3525 if (fromnd.ni_startdir) 3526 vrele(fromnd.ni_startdir); 3527 if (error == -1) 3528 return (0); 3529 return (error); 3530 } 3531 3532 /* 3533 * Make a directory file. 3534 */ 3535 #ifndef _SYS_SYSPROTO_H_ 3536 struct mkdir_args { 3537 char *path; 3538 int mode; 3539 }; 3540 #endif 3541 int 3542 sys_mkdir(struct thread *td, struct mkdir_args *uap) 3543 { 3544 3545 return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 3546 uap->mode)); 3547 } 3548 3549 #ifndef _SYS_SYSPROTO_H_ 3550 struct mkdirat_args { 3551 int fd; 3552 char *path; 3553 mode_t mode; 3554 }; 3555 #endif 3556 int 3557 sys_mkdirat(struct thread *td, struct mkdirat_args *uap) 3558 { 3559 3560 return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); 3561 } 3562 3563 int 3564 kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg, 3565 int mode) 3566 { 3567 struct mount *mp; 3568 struct vnode *vp; 3569 struct vattr vattr; 3570 struct nameidata nd; 3571 cap_rights_t rights; 3572 int error; 3573 3574 AUDIT_ARG_MODE(mode); 3575 restart: 3576 bwillwrite(); 3577 NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | 3578 NOCACHE, segflg, path, fd, cap_rights_init(&rights, CAP_MKDIRAT), 3579 td); 3580 nd.ni_cnd.cn_flags |= WILLBEDIR; 3581 if ((error = namei(&nd)) != 0) 3582 return (error); 3583 vp = nd.ni_vp; 3584 if (vp != NULL) { 3585 NDFREE(&nd, NDF_ONLY_PNBUF); 3586 /* 3587 * XXX namei called with LOCKPARENT but not LOCKLEAF has 3588 * the strange behaviour of leaving the vnode unlocked 3589 * if the target is the same vnode as the parent. 3590 */ 3591 if (vp == nd.ni_dvp) 3592 vrele(nd.ni_dvp); 3593 else 3594 vput(nd.ni_dvp); 3595 vrele(vp); 3596 return (EEXIST); 3597 } 3598 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3599 NDFREE(&nd, NDF_ONLY_PNBUF); 3600 vput(nd.ni_dvp); 3601 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3602 return (error); 3603 goto restart; 3604 } 3605 VATTR_NULL(&vattr); 3606 vattr.va_type = VDIR; 3607 vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; 3608 #ifdef MAC 3609 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, 3610 &vattr); 3611 if (error != 0) 3612 goto out; 3613 #endif 3614 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3615 #ifdef MAC 3616 out: 3617 #endif 3618 NDFREE(&nd, NDF_ONLY_PNBUF); 3619 vput(nd.ni_dvp); 3620 if (error == 0) 3621 vput(nd.ni_vp); 3622 vn_finished_write(mp); 3623 return (error); 3624 } 3625 3626 /* 3627 * Remove a directory file. 3628 */ 3629 #ifndef _SYS_SYSPROTO_H_ 3630 struct rmdir_args { 3631 char *path; 3632 }; 3633 #endif 3634 int 3635 sys_rmdir(struct thread *td, struct rmdir_args *uap) 3636 { 3637 3638 return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE)); 3639 } 3640 3641 int 3642 kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg) 3643 { 3644 struct mount *mp; 3645 struct vnode *vp; 3646 struct nameidata nd; 3647 cap_rights_t rights; 3648 int error; 3649 3650 restart: 3651 bwillwrite(); 3652 NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, 3653 pathseg, path, fd, cap_rights_init(&rights, CAP_UNLINKAT), td); 3654 if ((error = namei(&nd)) != 0) 3655 return (error); 3656 vp = nd.ni_vp; 3657 if (vp->v_type != VDIR) { 3658 error = ENOTDIR; 3659 goto out; 3660 } 3661 /* 3662 * No rmdir "." please. 3663 */ 3664 if (nd.ni_dvp == vp) { 3665 error = EINVAL; 3666 goto out; 3667 } 3668 /* 3669 * The root of a mounted filesystem cannot be deleted. 3670 */ 3671 if (vp->v_vflag & VV_ROOT) { 3672 error = EBUSY; 3673 goto out; 3674 } 3675 #ifdef MAC 3676 error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, 3677 &nd.ni_cnd); 3678 if (error != 0) 3679 goto out; 3680 #endif 3681 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3682 NDFREE(&nd, NDF_ONLY_PNBUF); 3683 vput(vp); 3684 if (nd.ni_dvp == vp) 3685 vrele(nd.ni_dvp); 3686 else 3687 vput(nd.ni_dvp); 3688 if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) 3689 return (error); 3690 goto restart; 3691 } 3692 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); 3693 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3694 vn_finished_write(mp); 3695 out: 3696 NDFREE(&nd, NDF_ONLY_PNBUF); 3697 vput(vp); 3698 if (nd.ni_dvp == vp) 3699 vrele(nd.ni_dvp); 3700 else 3701 vput(nd.ni_dvp); 3702 return (error); 3703 } 3704 3705 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) 3706 int 3707 freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, 3708 long *basep, void (*func)(struct freebsd11_dirent *)) 3709 { 3710 struct freebsd11_dirent dstdp; 3711 struct dirent *dp, *edp; 3712 char *dirbuf; 3713 off_t base; 3714 ssize_t resid, ucount; 3715 int error; 3716 3717 /* XXX arbitrary sanity limit on `count'. */ 3718 count = min(count, 64 * 1024); 3719 3720 dirbuf = malloc(count, M_TEMP, M_WAITOK); 3721 3722 error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, 3723 UIO_SYSSPACE); 3724 if (error != 0) 3725 goto done; 3726 if (basep != NULL) 3727 *basep = base; 3728 3729 ucount = 0; 3730 for (dp = (struct dirent *)dirbuf, 3731 edp = (struct dirent *)&dirbuf[count - resid]; 3732 ucount < count && dp < edp; ) { 3733 if (dp->d_reclen == 0) 3734 break; 3735 MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); 3736 if (dp->d_namlen >= sizeof(dstdp.d_name)) 3737 continue; 3738 dstdp.d_type = dp->d_type; 3739 dstdp.d_namlen = dp->d_namlen; 3740 dstdp.d_fileno = dp->d_fileno; /* truncate */ 3741 dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + 3742 ((dp->d_namlen + 1 + 3) &~ 3); 3743 bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); 3744 bzero(dstdp.d_name + dstdp.d_namlen, 3745 dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - 3746 dstdp.d_namlen); 3747 MPASS(dstdp.d_reclen <= dp->d_reclen); 3748 MPASS(ucount + dstdp.d_reclen <= count); 3749 if (func != NULL) 3750 func(&dstdp); 3751 error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); 3752 if (error != 0) 3753 break; 3754 dp = (struct dirent *)((char *)dp + dp->d_reclen); 3755 ucount += dstdp.d_reclen; 3756 } 3757 3758 done: 3759 free(dirbuf, M_TEMP); 3760 if (error == 0) 3761 td->td_retval[0] = ucount; 3762 return (error); 3763 } 3764 #endif /* COMPAT */ 3765 3766 #ifdef COMPAT_43 3767 static void 3768 ogetdirentries_cvt(struct freebsd11_dirent *dp) 3769 { 3770 #if (BYTE_ORDER == LITTLE_ENDIAN) 3771 /* 3772 * The expected low byte of dp->d_namlen is our dp->d_type. 3773 * The high MBZ byte of dp->d_namlen is our dp->d_namlen. 3774 */ 3775 dp->d_type = dp->d_namlen; 3776 dp->d_namlen = 0; 3777 #else 3778 /* 3779 * The dp->d_type is the high byte of the expected dp->d_namlen, 3780 * so must be zero'ed. 3781 */ 3782 dp->d_type = 0; 3783 #endif 3784 } 3785 3786 /* 3787 * Read a block of directory entries in a filesystem independent format. 3788 */ 3789 #ifndef _SYS_SYSPROTO_H_ 3790 struct ogetdirentries_args { 3791 int fd; 3792 char *buf; 3793 u_int count; 3794 long *basep; 3795 }; 3796 #endif 3797 int 3798 ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) 3799 { 3800 long loff; 3801 int error; 3802 3803 error = kern_ogetdirentries(td, uap, &loff); 3804 if (error == 0) 3805 error = copyout(&loff, uap->basep, sizeof(long)); 3806 return (error); 3807 } 3808 3809 int 3810 kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, 3811 long *ploff) 3812 { 3813 long base; 3814 int error; 3815 3816 /* XXX arbitrary sanity limit on `count'. */ 3817 if (uap->count > 64 * 1024) 3818 return (EINVAL); 3819 3820 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3821 &base, ogetdirentries_cvt); 3822 3823 if (error == 0 && uap->basep != NULL) 3824 error = copyout(&base, uap->basep, sizeof(long)); 3825 3826 return (error); 3827 } 3828 #endif /* COMPAT_43 */ 3829 3830 #if defined(COMPAT_FREEBSD11) 3831 #ifndef _SYS_SYSPROTO_H_ 3832 struct freebsd11_getdirentries_args { 3833 int fd; 3834 char *buf; 3835 u_int count; 3836 long *basep; 3837 }; 3838 #endif 3839 int 3840 freebsd11_getdirentries(struct thread *td, 3841 struct freebsd11_getdirentries_args *uap) 3842 { 3843 long base; 3844 int error; 3845 3846 error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, 3847 &base, NULL); 3848 3849 if (error == 0 && uap->basep != NULL) 3850 error = copyout(&base, uap->basep, sizeof(long)); 3851 return (error); 3852 } 3853 3854 int 3855 freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) 3856 { 3857 struct freebsd11_getdirentries_args ap; 3858 3859 ap.fd = uap->fd; 3860 ap.buf = uap->buf; 3861 ap.count = uap->count; 3862 ap.basep = NULL; 3863 return (freebsd11_getdirentries(td, &ap)); 3864 } 3865 #endif /* COMPAT_FREEBSD11 */ 3866 3867 /* 3868 * Read a block of directory entries in a filesystem independent format. 3869 */ 3870 int 3871 sys_getdirentries(struct thread *td, struct getdirentries_args *uap) 3872 { 3873 off_t base; 3874 int error; 3875 3876 error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, 3877 NULL, UIO_USERSPACE); 3878 if (error != 0) 3879 return (error); 3880 if (uap->basep != NULL) 3881 error = copyout(&base, uap->basep, sizeof(off_t)); 3882 return (error); 3883 } 3884 3885 int 3886 kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, 3887 off_t *basep, ssize_t *residp, enum uio_seg bufseg) 3888 { 3889 struct vnode *vp; 3890 struct file *fp; 3891 struct uio auio; 3892 struct iovec aiov; 3893 cap_rights_t rights; 3894 off_t loff; 3895 int error, eofflag; 3896 off_t foffset; 3897 3898 AUDIT_ARG_FD(fd); 3899 if (count > IOSIZE_MAX) 3900 return (EINVAL); 3901 auio.uio_resid = count; 3902 error = getvnode(td, fd, cap_rights_init(&rights, CAP_READ), &fp); 3903 if (error != 0) 3904 return (error); 3905 if ((fp->f_flag & FREAD) == 0) { 3906 fdrop(fp, td); 3907 return (EBADF); 3908 } 3909 vp = fp->f_vnode; 3910 foffset = foffset_lock(fp, 0); 3911 unionread: 3912 if (vp->v_type != VDIR) { 3913 error = EINVAL; 3914 goto fail; 3915 } 3916 aiov.iov_base = buf; 3917 aiov.iov_len = count; 3918 auio.uio_iov = &aiov; 3919 auio.uio_iovcnt = 1; 3920 auio.uio_rw = UIO_READ; 3921 auio.uio_segflg = bufseg; 3922 auio.uio_td = td; 3923 vn_lock(vp, LK_SHARED | LK_RETRY); 3924 AUDIT_ARG_VNODE1(vp); 3925 loff = auio.uio_offset = foffset; 3926 #ifdef MAC 3927 error = mac_vnode_check_readdir(td->td_ucred, vp); 3928 if (error == 0) 3929 #endif 3930 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, 3931 NULL); 3932 foffset = auio.uio_offset; 3933 if (error != 0) { 3934 VOP_UNLOCK(vp, 0); 3935 goto fail; 3936 } 3937 if (count == auio.uio_resid && 3938 (vp->v_vflag & VV_ROOT) && 3939 (vp->v_mount->mnt_flag & MNT_UNION)) { 3940 struct vnode *tvp = vp; 3941 3942 vp = vp->v_mount->mnt_vnodecovered; 3943 VREF(vp); 3944 fp->f_vnode = vp; 3945 fp->f_data = vp; 3946 foffset = 0; 3947 vput(tvp); 3948 goto unionread; 3949 } 3950 VOP_UNLOCK(vp, 0); 3951 *basep = loff; 3952 if (residp != NULL) 3953 *residp = auio.uio_resid; 3954 td->td_retval[0] = count - auio.uio_resid; 3955 fail: 3956 foffset_unlock(fp, foffset, 0); 3957 fdrop(fp, td); 3958 return (error); 3959 } 3960 3961 /* 3962 * Set the mode mask for creation of filesystem nodes. 3963 */ 3964 #ifndef _SYS_SYSPROTO_H_ 3965 struct umask_args { 3966 int newmask; 3967 }; 3968 #endif 3969 int 3970 sys_umask(struct thread *td, struct umask_args *uap) 3971 { 3972 struct filedesc *fdp; 3973 3974 fdp = td->td_proc->p_fd; 3975 FILEDESC_XLOCK(fdp); 3976 td->td_retval[0] = fdp->fd_cmask; 3977 fdp->fd_cmask = uap->newmask & ALLPERMS; 3978 FILEDESC_XUNLOCK(fdp); 3979 return (0); 3980 } 3981 3982 /* 3983 * Void all references to file by ripping underlying filesystem away from 3984 * vnode. 3985 */ 3986 #ifndef _SYS_SYSPROTO_H_ 3987 struct revoke_args { 3988 char *path; 3989 }; 3990 #endif 3991 int 3992 sys_revoke(struct thread *td, struct revoke_args *uap) 3993 { 3994 struct vnode *vp; 3995 struct vattr vattr; 3996 struct nameidata nd; 3997 int error; 3998 3999 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4000 uap->path, td); 4001 if ((error = namei(&nd)) != 0) 4002 return (error); 4003 vp = nd.ni_vp; 4004 NDFREE(&nd, NDF_ONLY_PNBUF); 4005 if (vp->v_type != VCHR || vp->v_rdev == NULL) { 4006 error = EINVAL; 4007 goto out; 4008 } 4009 #ifdef MAC 4010 error = mac_vnode_check_revoke(td->td_ucred, vp); 4011 if (error != 0) 4012 goto out; 4013 #endif 4014 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 4015 if (error != 0) 4016 goto out; 4017 if (td->td_ucred->cr_uid != vattr.va_uid) { 4018 error = priv_check(td, PRIV_VFS_ADMIN); 4019 if (error != 0) 4020 goto out; 4021 } 4022 if (vcount(vp) > 1) 4023 VOP_REVOKE(vp, REVOKEALL); 4024 out: 4025 vput(vp); 4026 return (error); 4027 } 4028 4029 /* 4030 * Convert a user file descriptor to a kernel file entry and check that, if it 4031 * is a capability, the correct rights are present. A reference on the file 4032 * entry is held upon returning. 4033 */ 4034 int 4035 getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) 4036 { 4037 struct file *fp; 4038 int error; 4039 4040 error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); 4041 if (error != 0) 4042 return (error); 4043 4044 /* 4045 * The file could be not of the vnode type, or it may be not 4046 * yet fully initialized, in which case the f_vnode pointer 4047 * may be set, but f_ops is still badfileops. E.g., 4048 * devfs_open() transiently create such situation to 4049 * facilitate csw d_fdopen(). 4050 * 4051 * Dupfdopen() handling in kern_openat() installs the 4052 * half-baked file into the process descriptor table, allowing 4053 * other thread to dereference it. Guard against the race by 4054 * checking f_ops. 4055 */ 4056 if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { 4057 fdrop(fp, td); 4058 return (EINVAL); 4059 } 4060 *fpp = fp; 4061 return (0); 4062 } 4063 4064 4065 /* 4066 * Get an (NFS) file handle. 4067 */ 4068 #ifndef _SYS_SYSPROTO_H_ 4069 struct lgetfh_args { 4070 char *fname; 4071 fhandle_t *fhp; 4072 }; 4073 #endif 4074 int 4075 sys_lgetfh(struct thread *td, struct lgetfh_args *uap) 4076 { 4077 struct nameidata nd; 4078 fhandle_t fh; 4079 struct vnode *vp; 4080 int error; 4081 4082 error = priv_check(td, PRIV_VFS_GETFH); 4083 if (error != 0) 4084 return (error); 4085 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4086 uap->fname, td); 4087 error = namei(&nd); 4088 if (error != 0) 4089 return (error); 4090 NDFREE(&nd, NDF_ONLY_PNBUF); 4091 vp = nd.ni_vp; 4092 bzero(&fh, sizeof(fh)); 4093 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4094 error = VOP_VPTOFH(vp, &fh.fh_fid); 4095 vput(vp); 4096 if (error == 0) 4097 error = copyout(&fh, uap->fhp, sizeof (fh)); 4098 return (error); 4099 } 4100 4101 #ifndef _SYS_SYSPROTO_H_ 4102 struct getfh_args { 4103 char *fname; 4104 fhandle_t *fhp; 4105 }; 4106 #endif 4107 int 4108 sys_getfh(struct thread *td, struct getfh_args *uap) 4109 { 4110 struct nameidata nd; 4111 fhandle_t fh; 4112 struct vnode *vp; 4113 int error; 4114 4115 error = priv_check(td, PRIV_VFS_GETFH); 4116 if (error != 0) 4117 return (error); 4118 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, 4119 uap->fname, td); 4120 error = namei(&nd); 4121 if (error != 0) 4122 return (error); 4123 NDFREE(&nd, NDF_ONLY_PNBUF); 4124 vp = nd.ni_vp; 4125 bzero(&fh, sizeof(fh)); 4126 fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; 4127 error = VOP_VPTOFH(vp, &fh.fh_fid); 4128 vput(vp); 4129 if (error == 0) 4130 error = copyout(&fh, uap->fhp, sizeof (fh)); 4131 return (error); 4132 } 4133 4134 /* 4135 * syscall for the rpc.lockd to use to translate a NFS file handle into an 4136 * open descriptor. 4137 * 4138 * warning: do not remove the priv_check() call or this becomes one giant 4139 * security hole. 4140 */ 4141 #ifndef _SYS_SYSPROTO_H_ 4142 struct fhopen_args { 4143 const struct fhandle *u_fhp; 4144 int flags; 4145 }; 4146 #endif 4147 int 4148 sys_fhopen(struct thread *td, struct fhopen_args *uap) 4149 { 4150 struct mount *mp; 4151 struct vnode *vp; 4152 struct fhandle fhp; 4153 struct file *fp; 4154 int fmode, error; 4155 int indx; 4156 4157 error = priv_check(td, PRIV_VFS_FHOPEN); 4158 if (error != 0) 4159 return (error); 4160 indx = -1; 4161 fmode = FFLAGS(uap->flags); 4162 /* why not allow a non-read/write open for our lockd? */ 4163 if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) 4164 return (EINVAL); 4165 error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); 4166 if (error != 0) 4167 return(error); 4168 /* find the mount point */ 4169 mp = vfs_busyfs(&fhp.fh_fsid); 4170 if (mp == NULL) 4171 return (ESTALE); 4172 /* now give me my vnode, it gets returned to me locked */ 4173 error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); 4174 vfs_unbusy(mp); 4175 if (error != 0) 4176 return (error); 4177 4178 error = falloc_noinstall(td, &fp); 4179 if (error != 0) { 4180 vput(vp); 4181 return (error); 4182 } 4183 /* 4184 * An extra reference on `fp' has been held for us by 4185 * falloc_noinstall(). 4186 */ 4187 4188 #ifdef INVARIANTS 4189 td->td_dupfd = -1; 4190 #endif 4191 error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); 4192 if (error != 0) { 4193 KASSERT(fp->f_ops == &badfileops, 4194 ("VOP_OPEN in fhopen() set f_ops")); 4195 KASSERT(td->td_dupfd < 0, 4196 ("fhopen() encountered fdopen()")); 4197 4198 vput(vp); 4199 goto bad; 4200 } 4201 #ifdef INVARIANTS 4202 td->td_dupfd = 0; 4203 #endif 4204 fp->f_vnode = vp; 4205 fp->f_seqcount = 1; 4206 finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp, 4207 &vnops); 4208 VOP_UNLOCK(vp, 0); 4209 if ((fmode & O_TRUNC) != 0) { 4210 error = fo_truncate(fp, 0, td->td_ucred, td); 4211 if (error != 0) 4212 goto bad; 4213 } 4214 4215 error = finstall(td, fp, &indx, fmode, NULL); 4216 bad: 4217 fdrop(fp, td); 4218 td->td_retval[0] = indx; 4219 return (error); 4220 } 4221 4222 /* 4223 * Stat an (NFS) file handle. 4224 */ 4225 #ifndef _SYS_SYSPROTO_H_ 4226 struct fhstat_args { 4227 struct fhandle *u_fhp; 4228 struct stat *sb; 4229 }; 4230 #endif 4231 int 4232 sys_fhstat(struct thread *td, struct fhstat_args *uap) 4233 { 4234 struct stat sb; 4235 struct fhandle fh; 4236 int error; 4237 4238 error = copyin(uap->u_fhp, &fh, sizeof(fh)); 4239 if (error != 0) 4240 return (error); 4241 error = kern_fhstat(td, fh, &sb); 4242 if (error == 0) 4243 error = copyout(&sb, uap->sb, sizeof(sb)); 4244 return (error); 4245 } 4246 4247 int 4248 kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) 4249 { 4250 struct mount *mp; 4251 struct vnode *vp; 4252 int error; 4253 4254 error = priv_check(td, PRIV_VFS_FHSTAT); 4255 if (error != 0) 4256 return (error); 4257 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4258 return (ESTALE); 4259 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4260 vfs_unbusy(mp); 4261 if (error != 0) 4262 return (error); 4263 error = vn_stat(vp, sb, td->td_ucred, NOCRED, td); 4264 vput(vp); 4265 return (error); 4266 } 4267 4268 /* 4269 * Implement fstatfs() for (NFS) file handles. 4270 */ 4271 #ifndef _SYS_SYSPROTO_H_ 4272 struct fhstatfs_args { 4273 struct fhandle *u_fhp; 4274 struct statfs *buf; 4275 }; 4276 #endif 4277 int 4278 sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) 4279 { 4280 struct statfs *sfp; 4281 fhandle_t fh; 4282 int error; 4283 4284 error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); 4285 if (error != 0) 4286 return (error); 4287 sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); 4288 error = kern_fhstatfs(td, fh, sfp); 4289 if (error == 0) 4290 error = copyout(sfp, uap->buf, sizeof(*sfp)); 4291 free(sfp, M_STATFS); 4292 return (error); 4293 } 4294 4295 int 4296 kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) 4297 { 4298 struct statfs *sp; 4299 struct mount *mp; 4300 struct vnode *vp; 4301 int error; 4302 4303 error = priv_check(td, PRIV_VFS_FHSTATFS); 4304 if (error != 0) 4305 return (error); 4306 if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) 4307 return (ESTALE); 4308 error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); 4309 if (error != 0) { 4310 vfs_unbusy(mp); 4311 return (error); 4312 } 4313 vput(vp); 4314 error = prison_canseemount(td->td_ucred, mp); 4315 if (error != 0) 4316 goto out; 4317 #ifdef MAC 4318 error = mac_mount_check_stat(td->td_ucred, mp); 4319 if (error != 0) 4320 goto out; 4321 #endif 4322 /* 4323 * Set these in case the underlying filesystem fails to do so. 4324 */ 4325 sp = &mp->mnt_stat; 4326 sp->f_version = STATFS_VERSION; 4327 sp->f_namemax = NAME_MAX; 4328 sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; 4329 error = VFS_STATFS(mp, sp); 4330 if (error == 0) 4331 *buf = *sp; 4332 out: 4333 vfs_unbusy(mp); 4334 return (error); 4335 } 4336 4337 int 4338 kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len) 4339 { 4340 struct file *fp; 4341 struct mount *mp; 4342 struct vnode *vp; 4343 cap_rights_t rights; 4344 off_t olen, ooffset; 4345 int error; 4346 #ifdef AUDIT 4347 int audited_vnode1 = 0; 4348 #endif 4349 4350 AUDIT_ARG_FD(fd); 4351 if (offset < 0 || len <= 0) 4352 return (EINVAL); 4353 /* Check for wrap. */ 4354 if (offset > OFF_MAX - len) 4355 return (EFBIG); 4356 AUDIT_ARG_FD(fd); 4357 error = fget(td, fd, cap_rights_init(&rights, CAP_WRITE), &fp); 4358 if (error != 0) 4359 return (error); 4360 AUDIT_ARG_FILE(td->td_proc, fp); 4361 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4362 error = ESPIPE; 4363 goto out; 4364 } 4365 if ((fp->f_flag & FWRITE) == 0) { 4366 error = EBADF; 4367 goto out; 4368 } 4369 if (fp->f_type != DTYPE_VNODE) { 4370 error = ENODEV; 4371 goto out; 4372 } 4373 vp = fp->f_vnode; 4374 if (vp->v_type != VREG) { 4375 error = ENODEV; 4376 goto out; 4377 } 4378 4379 /* Allocating blocks may take a long time, so iterate. */ 4380 for (;;) { 4381 olen = len; 4382 ooffset = offset; 4383 4384 bwillwrite(); 4385 mp = NULL; 4386 error = vn_start_write(vp, &mp, V_WAIT | PCATCH); 4387 if (error != 0) 4388 break; 4389 error = vn_lock(vp, LK_EXCLUSIVE); 4390 if (error != 0) { 4391 vn_finished_write(mp); 4392 break; 4393 } 4394 #ifdef AUDIT 4395 if (!audited_vnode1) { 4396 AUDIT_ARG_VNODE1(vp); 4397 audited_vnode1 = 1; 4398 } 4399 #endif 4400 #ifdef MAC 4401 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp); 4402 if (error == 0) 4403 #endif 4404 error = VOP_ALLOCATE(vp, &offset, &len); 4405 VOP_UNLOCK(vp, 0); 4406 vn_finished_write(mp); 4407 4408 if (olen + ooffset != offset + len) { 4409 panic("offset + len changed from %jx/%jx to %jx/%jx", 4410 ooffset, olen, offset, len); 4411 } 4412 if (error != 0 || len == 0) 4413 break; 4414 KASSERT(olen > len, ("Iteration did not make progress?")); 4415 maybe_yield(); 4416 } 4417 out: 4418 fdrop(fp, td); 4419 return (error); 4420 } 4421 4422 int 4423 sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap) 4424 { 4425 int error; 4426 4427 error = kern_posix_fallocate(td, uap->fd, uap->offset, uap->len); 4428 return (kern_posix_error(td, error)); 4429 } 4430 4431 /* 4432 * Unlike madvise(2), we do not make a best effort to remember every 4433 * possible caching hint. Instead, we remember the last setting with 4434 * the exception that we will allow POSIX_FADV_NORMAL to adjust the 4435 * region of any current setting. 4436 */ 4437 int 4438 kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, 4439 int advice) 4440 { 4441 struct fadvise_info *fa, *new; 4442 struct file *fp; 4443 struct vnode *vp; 4444 cap_rights_t rights; 4445 off_t end; 4446 int error; 4447 4448 if (offset < 0 || len < 0 || offset > OFF_MAX - len) 4449 return (EINVAL); 4450 AUDIT_ARG_VALUE(advice); 4451 switch (advice) { 4452 case POSIX_FADV_SEQUENTIAL: 4453 case POSIX_FADV_RANDOM: 4454 case POSIX_FADV_NOREUSE: 4455 new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); 4456 break; 4457 case POSIX_FADV_NORMAL: 4458 case POSIX_FADV_WILLNEED: 4459 case POSIX_FADV_DONTNEED: 4460 new = NULL; 4461 break; 4462 default: 4463 return (EINVAL); 4464 } 4465 /* XXX: CAP_POSIX_FADVISE? */ 4466 AUDIT_ARG_FD(fd); 4467 error = fget(td, fd, cap_rights_init(&rights), &fp); 4468 if (error != 0) 4469 goto out; 4470 AUDIT_ARG_FILE(td->td_proc, fp); 4471 if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { 4472 error = ESPIPE; 4473 goto out; 4474 } 4475 if (fp->f_type != DTYPE_VNODE) { 4476 error = ENODEV; 4477 goto out; 4478 } 4479 vp = fp->f_vnode; 4480 if (vp->v_type != VREG) { 4481 error = ENODEV; 4482 goto out; 4483 } 4484 if (len == 0) 4485 end = OFF_MAX; 4486 else 4487 end = offset + len - 1; 4488 switch (advice) { 4489 case POSIX_FADV_SEQUENTIAL: 4490 case POSIX_FADV_RANDOM: 4491 case POSIX_FADV_NOREUSE: 4492 /* 4493 * Try to merge any existing non-standard region with 4494 * this new region if possible, otherwise create a new 4495 * non-standard region for this request. 4496 */ 4497 mtx_pool_lock(mtxpool_sleep, fp); 4498 fa = fp->f_advice; 4499 if (fa != NULL && fa->fa_advice == advice && 4500 ((fa->fa_start <= end && fa->fa_end >= offset) || 4501 (end != OFF_MAX && fa->fa_start == end + 1) || 4502 (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { 4503 if (offset < fa->fa_start) 4504 fa->fa_start = offset; 4505 if (end > fa->fa_end) 4506 fa->fa_end = end; 4507 } else { 4508 new->fa_advice = advice; 4509 new->fa_start = offset; 4510 new->fa_end = end; 4511 fp->f_advice = new; 4512 new = fa; 4513 } 4514 mtx_pool_unlock(mtxpool_sleep, fp); 4515 break; 4516 case POSIX_FADV_NORMAL: 4517 /* 4518 * If a the "normal" region overlaps with an existing 4519 * non-standard region, trim or remove the 4520 * non-standard region. 4521 */ 4522 mtx_pool_lock(mtxpool_sleep, fp); 4523 fa = fp->f_advice; 4524 if (fa != NULL) { 4525 if (offset <= fa->fa_start && end >= fa->fa_end) { 4526 new = fa; 4527 fp->f_advice = NULL; 4528 } else if (offset <= fa->fa_start && 4529 end >= fa->fa_start) 4530 fa->fa_start = end + 1; 4531 else if (offset <= fa->fa_end && end >= fa->fa_end) 4532 fa->fa_end = offset - 1; 4533 else if (offset >= fa->fa_start && end <= fa->fa_end) { 4534 /* 4535 * If the "normal" region is a middle 4536 * portion of the existing 4537 * non-standard region, just remove 4538 * the whole thing rather than picking 4539 * one side or the other to 4540 * preserve. 4541 */ 4542 new = fa; 4543 fp->f_advice = NULL; 4544 } 4545 } 4546 mtx_pool_unlock(mtxpool_sleep, fp); 4547 break; 4548 case POSIX_FADV_WILLNEED: 4549 case POSIX_FADV_DONTNEED: 4550 error = VOP_ADVISE(vp, offset, end, advice); 4551 break; 4552 } 4553 out: 4554 if (fp != NULL) 4555 fdrop(fp, td); 4556 free(new, M_FADVISE); 4557 return (error); 4558 } 4559 4560 int 4561 sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) 4562 { 4563 int error; 4564 4565 error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, 4566 uap->advice); 4567 return (kern_posix_error(td, error)); 4568 } 4569