1 /* $OpenBSD: vnd.c,v 1.171 2019/11/27 16:12:13 beck Exp $ */ 2 /* $NetBSD: vnd.c,v 1.26 1996/03/30 23:06:11 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1988 University of Utah. 6 * Copyright (c) 1990, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * the Systems Programming Group of the University of Utah Computer 11 * Science Department. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 /* 39 * There is a security issue involved with this driver. 40 * 41 * Once mounted all access to the contents of the "mapped" file via 42 * the special file is controlled by the permissions on the special 43 * file, the protection of the mapped file is ignored (effectively, 44 * by using root credentials in all transactions). 45 * 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/namei.h> 51 #include <sys/proc.h> 52 #include <sys/errno.h> 53 #include <sys/limits.h> 54 #include <sys/buf.h> 55 #include <sys/malloc.h> 56 #include <sys/ioctl.h> 57 #include <sys/disklabel.h> 58 #include <sys/device.h> 59 #include <sys/disk.h> 60 #include <sys/stat.h> 61 #include <sys/vnode.h> 62 #include <sys/fcntl.h> 63 #include <sys/uio.h> 64 #include <sys/conf.h> 65 #include <sys/dkio.h> 66 #include <sys/specdev.h> 67 68 #include <crypto/blf.h> 69 70 #include <dev/vndioctl.h> 71 72 #ifdef VNDDEBUG 73 int vnddebug = 0x00; 74 #define VDB_FOLLOW 0x01 75 #define VDB_INIT 0x02 76 #define VDB_IO 0x04 77 #define DNPRINTF(f, p...) do { if ((f) & vnddebug) printf(p); } while (0) 78 #else 79 #define DNPRINTF(f, p...) /* nothing */ 80 #endif /* VNDDEBUG */ 81 82 struct vnd_softc { 83 struct device sc_dev; 84 struct disk sc_dk; 85 86 char sc_file[VNDNLEN]; /* file we're covering */ 87 int sc_flags; /* flags */ 88 size_t sc_size; /* size of vnd in sectors */ 89 size_t sc_secsize; /* sector size in bytes */ 90 size_t sc_nsectors; /* # of sectors per track */ 91 size_t sc_ntracks; /* # of tracks per cylinder */ 92 struct vnode *sc_vp; /* vnode */ 93 struct ucred *sc_cred; /* credentials */ 94 blf_ctx *sc_keyctx; /* key context */ 95 }; 96 97 /* sc_flags */ 98 #define VNF_INITED 0x0001 99 #define VNF_HAVELABEL 0x0002 100 #define VNF_READONLY 0x0004 101 102 #define VNDRW(v) ((v)->sc_flags & VNF_READONLY ? FREAD : FREAD|FWRITE) 103 104 struct vnd_softc *vnd_softc; 105 int numvnd = 0; 106 107 /* called by main() at boot time */ 108 void vndattach(int); 109 110 void vndclear(struct vnd_softc *); 111 int vndsetcred(struct vnd_softc *, struct ucred *); 112 int vndgetdisklabel(dev_t, struct vnd_softc *, struct disklabel *, int); 113 void vndencrypt(struct vnd_softc *, caddr_t, size_t, daddr_t, int); 114 void vndencryptbuf(struct vnd_softc *, struct buf *, int); 115 size_t vndbdevsize(struct vnode *, struct proc *); 116 117 void 118 vndencrypt(struct vnd_softc *sc, caddr_t addr, size_t size, daddr_t off, 119 int encrypt) 120 { 121 int i, bsize; 122 u_char iv[8]; 123 124 bsize = dbtob(1); 125 for (i = 0; i < size/bsize; i++) { 126 memset(iv, 0, sizeof(iv)); 127 memcpy(iv, &off, sizeof(off)); 128 blf_ecb_encrypt(sc->sc_keyctx, iv, sizeof(iv)); 129 if (encrypt) 130 blf_cbc_encrypt(sc->sc_keyctx, iv, addr, bsize); 131 else 132 blf_cbc_decrypt(sc->sc_keyctx, iv, addr, bsize); 133 134 addr += bsize; 135 off++; 136 } 137 } 138 139 void 140 vndencryptbuf(struct vnd_softc *sc, struct buf *bp, int encrypt) 141 { 142 vndencrypt(sc, bp->b_data, bp->b_bcount, bp->b_blkno, encrypt); 143 } 144 145 void 146 vndattach(int num) 147 { 148 char *mem; 149 int i; 150 151 if (num <= 0) 152 return; 153 mem = mallocarray(num, sizeof(struct vnd_softc), M_DEVBUF, 154 M_NOWAIT | M_ZERO); 155 if (mem == NULL) { 156 printf("WARNING: no memory for vnode disks\n"); 157 return; 158 } 159 vnd_softc = (struct vnd_softc *)mem; 160 for (i = 0; i < num; i++) { 161 struct vnd_softc *sc = &vnd_softc[i]; 162 163 sc->sc_dev.dv_unit = i; 164 snprintf(sc->sc_dev.dv_xname, sizeof(sc->sc_dev.dv_xname), 165 "vnd%d", i); 166 disk_construct(&sc->sc_dk); 167 device_ref(&sc->sc_dev); 168 } 169 numvnd = num; 170 } 171 172 int 173 vndopen(dev_t dev, int flags, int mode, struct proc *p) 174 { 175 int unit = DISKUNIT(dev); 176 struct vnd_softc *sc; 177 int error = 0, part; 178 179 DNPRINTF(VDB_FOLLOW, "vndopen(%x, %x, %x, %p)\n", dev, flags, mode, p); 180 181 if (unit >= numvnd) 182 return (ENXIO); 183 sc = &vnd_softc[unit]; 184 185 if ((error = disk_lock(&sc->sc_dk)) != 0) 186 return (error); 187 188 if ((flags & FWRITE) && (sc->sc_flags & VNF_READONLY)) { 189 error = EROFS; 190 goto bad; 191 } 192 193 if ((sc->sc_flags & VNF_INITED) && 194 (sc->sc_flags & VNF_HAVELABEL) == 0 && 195 sc->sc_dk.dk_openmask == 0) { 196 sc->sc_flags |= VNF_HAVELABEL; 197 vndgetdisklabel(dev, sc, sc->sc_dk.dk_label, 0); 198 } 199 200 part = DISKPART(dev); 201 error = disk_openpart(&sc->sc_dk, part, mode, 202 (sc->sc_flags & VNF_HAVELABEL) != 0); 203 204 bad: 205 disk_unlock(&sc->sc_dk); 206 return (error); 207 } 208 209 /* 210 * Load the label information on the named device 211 */ 212 int 213 vndgetdisklabel(dev_t dev, struct vnd_softc *sc, struct disklabel *lp, 214 int spoofonly) 215 { 216 memset(lp, 0, sizeof(struct disklabel)); 217 218 lp->d_secsize = sc->sc_secsize; 219 lp->d_nsectors = sc->sc_nsectors; 220 lp->d_ntracks = sc->sc_ntracks; 221 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 222 if (lp->d_secpercyl) 223 lp->d_ncylinders = sc->sc_size / lp->d_secpercyl; 224 225 strncpy(lp->d_typename, "vnd device", sizeof(lp->d_typename)); 226 lp->d_type = DTYPE_VND; 227 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 228 DL_SETDSIZE(lp, sc->sc_size); 229 lp->d_flags = 0; 230 lp->d_version = 1; 231 232 lp->d_magic = DISKMAGIC; 233 lp->d_magic2 = DISKMAGIC; 234 lp->d_checksum = dkcksum(lp); 235 236 /* Call the generic disklabel extraction routine */ 237 return readdisklabel(DISKLABELDEV(dev), vndstrategy, lp, spoofonly); 238 } 239 240 int 241 vndclose(dev_t dev, int flags, int mode, struct proc *p) 242 { 243 int unit = DISKUNIT(dev); 244 struct vnd_softc *sc; 245 int part; 246 247 DNPRINTF(VDB_FOLLOW, "vndclose(%x, %x, %x, %p)\n", dev, flags, mode, p); 248 249 if (unit >= numvnd) 250 return (ENXIO); 251 sc = &vnd_softc[unit]; 252 253 disk_lock_nointr(&sc->sc_dk); 254 255 part = DISKPART(dev); 256 257 disk_closepart(&sc->sc_dk, part, mode); 258 259 #if 0 260 if (sc->sc_dk.dk_openmask == 0) 261 sc->sc_flags &= ~VNF_HAVELABEL; 262 #endif 263 264 disk_unlock(&sc->sc_dk); 265 return (0); 266 } 267 268 void 269 vndstrategy(struct buf *bp) 270 { 271 int unit = DISKUNIT(bp->b_dev); 272 struct vnd_softc *sc; 273 struct partition *p; 274 off_t off; 275 long origbcount; 276 int s; 277 278 DNPRINTF(VDB_FOLLOW, "vndstrategy(%p): unit %d\n", bp, unit); 279 280 if (unit >= numvnd) { 281 bp->b_error = ENXIO; 282 goto bad; 283 } 284 sc = &vnd_softc[unit]; 285 286 if ((sc->sc_flags & VNF_HAVELABEL) == 0) { 287 bp->b_error = ENXIO; 288 goto bad; 289 } 290 291 /* 292 * Many of the distrib scripts assume they can issue arbitrary 293 * sized requests to raw vnd devices irrespective of the 294 * emulated disk geometry. 295 * 296 * To continue supporting this, round the block count up to a 297 * multiple of d_secsize for bounds_check_with_label(), and 298 * then restore afterwards. 299 * 300 * We only do this for non-encrypted vnd, because encryption 301 * requires operating on blocks at a time. 302 */ 303 origbcount = bp->b_bcount; 304 if (sc->sc_keyctx == NULL) { 305 u_int32_t secsize = sc->sc_dk.dk_label->d_secsize; 306 bp->b_bcount = ((origbcount + secsize - 1) & ~(secsize - 1)); 307 #ifdef DIAGNOSTIC 308 if (bp->b_bcount != origbcount) { 309 struct process *curpr = curproc->p_p; 310 printf("%s: sloppy %s from proc %d (%s): " 311 "blkno %lld bcount %ld\n", sc->sc_dev.dv_xname, 312 (bp->b_flags & B_READ) ? "read" : "write", 313 curpr->ps_pid, curpr->ps_comm, 314 (long long)bp->b_blkno, origbcount); 315 } 316 #endif 317 } 318 319 if (bounds_check_with_label(bp, sc->sc_dk.dk_label) == -1) { 320 bp->b_resid = bp->b_bcount = origbcount; 321 goto done; 322 } 323 324 if (origbcount < bp->b_bcount) 325 bp->b_bcount = origbcount; 326 327 p = &sc->sc_dk.dk_label->d_partitions[DISKPART(bp->b_dev)]; 328 off = DL_GETPOFFSET(p) * sc->sc_dk.dk_label->d_secsize + 329 (u_int64_t)bp->b_blkno * DEV_BSIZE; 330 331 if (sc->sc_keyctx && !(bp->b_flags & B_READ)) 332 vndencryptbuf(sc, bp, 1); 333 334 /* 335 * Use IO_NOLIMIT because upper layer has already checked I/O 336 * for limits, so there is no need to do it again. 337 * 338 * We use IO_NOCACHE because this data should be cached at the 339 * upper layer, so there is no need to cache it again. 340 */ 341 bp->b_error = vn_rdwr((bp->b_flags & B_READ) ? UIO_READ : UIO_WRITE, 342 sc->sc_vp, bp->b_data, bp->b_bcount, off, UIO_SYSSPACE, 343 IO_NOCACHE | IO_SYNC | IO_NOLIMIT, sc->sc_cred, &bp->b_resid, curproc); 344 if (bp->b_error) 345 bp->b_flags |= B_ERROR; 346 347 /* Data in buffer cache needs to be in clear */ 348 if (sc->sc_keyctx) 349 vndencryptbuf(sc, bp, 0); 350 351 goto done; 352 353 bad: 354 bp->b_flags |= B_ERROR; 355 bp->b_resid = bp->b_bcount; 356 done: 357 s = splbio(); 358 biodone(bp); 359 splx(s); 360 } 361 362 /* ARGSUSED */ 363 int 364 vndread(dev_t dev, struct uio *uio, int flags) 365 { 366 return (physio(vndstrategy, dev, B_READ, minphys, uio)); 367 } 368 369 /* ARGSUSED */ 370 int 371 vndwrite(dev_t dev, struct uio *uio, int flags) 372 { 373 return (physio(vndstrategy, dev, B_WRITE, minphys, uio)); 374 } 375 376 size_t 377 vndbdevsize(struct vnode *vp, struct proc *p) 378 { 379 struct partinfo pi; 380 struct bdevsw *bsw; 381 dev_t dev; 382 383 dev = vp->v_rdev; 384 bsw = bdevsw_lookup(dev); 385 if (bsw->d_ioctl == NULL) 386 return (0); 387 if (bsw->d_ioctl(dev, DIOCGPART, (caddr_t)&pi, FREAD, p)) 388 return (0); 389 DNPRINTF(VDB_INIT, "vndbdevsize: size %llu secsize %u\n", 390 DL_GETPSIZE(pi.part), pi.disklab->d_secsize); 391 return (DL_GETPSIZE(pi.part)); 392 } 393 394 /* ARGSUSED */ 395 int 396 vndioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 397 { 398 int unit = DISKUNIT(dev); 399 struct disklabel *lp; 400 struct vnd_softc *sc; 401 struct vnd_ioctl *vio; 402 struct vnd_user *vnu; 403 struct vattr vattr; 404 struct nameidata nd; 405 int error, part, pmask; 406 407 DNPRINTF(VDB_FOLLOW, "vndioctl(%x, %lx, %p, %x, %p): unit %d\n", 408 dev, cmd, addr, flag, p, unit); 409 410 error = suser(p); 411 if (error) 412 return (error); 413 if (unit >= numvnd) 414 return (ENXIO); 415 416 sc = &vnd_softc[unit]; 417 vio = (struct vnd_ioctl *)addr; 418 switch (cmd) { 419 420 case VNDIOCSET: 421 if (sc->sc_flags & VNF_INITED) 422 return (EBUSY); 423 424 /* Geometry eventually has to fit into label fields */ 425 if (vio->vnd_secsize > UINT_MAX || 426 vio->vnd_secsize == 0 || 427 vio->vnd_ntracks > UINT_MAX || 428 vio->vnd_nsectors > UINT_MAX) 429 return (EINVAL); 430 431 if ((error = disk_lock(&sc->sc_dk)) != 0) 432 return (error); 433 434 if ((error = copyinstr(vio->vnd_file, sc->sc_file, 435 sizeof(sc->sc_file), NULL))) { 436 disk_unlock(&sc->sc_dk); 437 return (error); 438 } 439 440 /* Set geometry for device. */ 441 sc->sc_secsize = vio->vnd_secsize; 442 sc->sc_ntracks = vio->vnd_ntracks; 443 sc->sc_nsectors = vio->vnd_nsectors; 444 445 /* 446 * Open for read and write first. This lets vn_open() weed out 447 * directories, sockets, etc. so we don't have to worry about 448 * them. 449 */ 450 NDINIT(&nd, 0, 0, UIO_USERSPACE, vio->vnd_file, p); 451 sc->sc_flags &= ~VNF_READONLY; 452 error = vn_open(&nd, FREAD|FWRITE, 0); 453 if (error == EROFS) { 454 NDINIT(&nd, 0, 0, UIO_USERSPACE, vio->vnd_file, p); 455 sc->sc_flags |= VNF_READONLY; 456 error = vn_open(&nd, FREAD, 0); 457 } 458 if (error) { 459 disk_unlock(&sc->sc_dk); 460 return (error); 461 } 462 463 if (nd.ni_vp->v_type == VBLK) 464 sc->sc_size = vndbdevsize(nd.ni_vp, p); 465 else { 466 error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p); 467 if (error) { 468 VOP_UNLOCK(nd.ni_vp); 469 vn_close(nd.ni_vp, VNDRW(sc), p->p_ucred, p); 470 disk_unlock(&sc->sc_dk); 471 return (error); 472 } 473 sc->sc_size = vattr.va_size / sc->sc_secsize; 474 } 475 VOP_UNLOCK(nd.ni_vp); 476 sc->sc_vp = nd.ni_vp; 477 if ((error = vndsetcred(sc, p->p_ucred)) != 0) { 478 (void) vn_close(nd.ni_vp, VNDRW(sc), p->p_ucred, p); 479 disk_unlock(&sc->sc_dk); 480 return (error); 481 } 482 483 if (vio->vnd_keylen > 0) { 484 char key[BLF_MAXUTILIZED]; 485 486 if (vio->vnd_keylen > sizeof(key)) 487 vio->vnd_keylen = sizeof(key); 488 489 if ((error = copyin(vio->vnd_key, key, 490 vio->vnd_keylen)) != 0) { 491 (void) vn_close(nd.ni_vp, VNDRW(sc), 492 p->p_ucred, p); 493 disk_unlock(&sc->sc_dk); 494 return (error); 495 } 496 497 sc->sc_keyctx = malloc(sizeof(*sc->sc_keyctx), M_DEVBUF, 498 M_WAITOK); 499 blf_key(sc->sc_keyctx, key, vio->vnd_keylen); 500 explicit_bzero(key, vio->vnd_keylen); 501 } else 502 sc->sc_keyctx = NULL; 503 504 vio->vnd_size = sc->sc_size * sc->sc_secsize; 505 sc->sc_flags |= VNF_INITED; 506 507 DNPRINTF(VDB_INIT, "vndioctl: SET vp %p size %llx\n", 508 sc->sc_vp, (unsigned long long)sc->sc_size); 509 510 /* Attach the disk. */ 511 sc->sc_dk.dk_name = sc->sc_dev.dv_xname; 512 disk_attach(&sc->sc_dev, &sc->sc_dk); 513 514 disk_unlock(&sc->sc_dk); 515 516 break; 517 518 case VNDIOCCLR: 519 if ((sc->sc_flags & VNF_INITED) == 0) 520 return (ENXIO); 521 522 if ((error = disk_lock(&sc->sc_dk)) != 0) 523 return (error); 524 525 /* 526 * Don't unconfigure if any other partitions are open 527 * or if both the character and block flavors of this 528 * partition are open. 529 */ 530 part = DISKPART(dev); 531 pmask = (1 << part); 532 if ((sc->sc_dk.dk_openmask & ~pmask) || 533 ((sc->sc_dk.dk_bopenmask & pmask) && 534 (sc->sc_dk.dk_copenmask & pmask))) { 535 disk_unlock(&sc->sc_dk); 536 return (EBUSY); 537 } 538 539 vndclear(sc); 540 DNPRINTF(VDB_INIT, "vndioctl: CLRed\n"); 541 542 /* Free crypto key */ 543 if (sc->sc_keyctx) { 544 explicit_bzero(sc->sc_keyctx, sizeof(*sc->sc_keyctx)); 545 free(sc->sc_keyctx, M_DEVBUF, sizeof(*sc->sc_keyctx)); 546 } 547 548 /* Detach the disk. */ 549 disk_detach(&sc->sc_dk); 550 disk_unlock(&sc->sc_dk); 551 break; 552 553 case VNDIOCGET: 554 vnu = (struct vnd_user *)addr; 555 556 if (vnu->vnu_unit == -1) 557 vnu->vnu_unit = unit; 558 if (vnu->vnu_unit >= numvnd) 559 return (ENXIO); 560 if (vnu->vnu_unit < 0) 561 return (EINVAL); 562 563 sc = &vnd_softc[vnu->vnu_unit]; 564 565 if (sc->sc_flags & VNF_INITED) { 566 error = VOP_GETATTR(sc->sc_vp, &vattr, p->p_ucred, p); 567 if (error) 568 return (error); 569 570 strlcpy(vnu->vnu_file, sc->sc_file, 571 sizeof(vnu->vnu_file)); 572 vnu->vnu_dev = vattr.va_fsid; 573 vnu->vnu_ino = vattr.va_fileid; 574 } else { 575 vnu->vnu_dev = 0; 576 vnu->vnu_ino = 0; 577 } 578 579 break; 580 581 case DIOCRLDINFO: 582 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 583 return (ENOTTY); 584 lp = malloc(sizeof(*lp), M_TEMP, M_WAITOK); 585 vndgetdisklabel(dev, sc, lp, 0); 586 *(sc->sc_dk.dk_label) = *lp; 587 free(lp, M_TEMP, sizeof(*lp)); 588 return (0); 589 590 case DIOCGPDINFO: 591 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 592 return (ENOTTY); 593 vndgetdisklabel(dev, sc, (struct disklabel *)addr, 1); 594 return (0); 595 596 case DIOCGDINFO: 597 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 598 return (ENOTTY); 599 *(struct disklabel *)addr = *(sc->sc_dk.dk_label); 600 return (0); 601 602 case DIOCGPART: 603 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 604 return (ENOTTY); 605 ((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label; 606 ((struct partinfo *)addr)->part = 607 &sc->sc_dk.dk_label->d_partitions[DISKPART(dev)]; 608 return (0); 609 610 case DIOCWDINFO: 611 case DIOCSDINFO: 612 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 613 return (ENOTTY); 614 if ((flag & FWRITE) == 0) 615 return (EBADF); 616 617 if ((error = disk_lock(&sc->sc_dk)) != 0) 618 return (error); 619 620 error = setdisklabel(sc->sc_dk.dk_label, 621 (struct disklabel *)addr, /* sc->sc_dk.dk_openmask */ 0); 622 if (error == 0) { 623 if (cmd == DIOCWDINFO) 624 error = writedisklabel(DISKLABELDEV(dev), 625 vndstrategy, sc->sc_dk.dk_label); 626 } 627 628 disk_unlock(&sc->sc_dk); 629 return (error); 630 631 default: 632 return (ENOTTY); 633 } 634 635 return (0); 636 } 637 638 /* 639 * Duplicate the current processes' credentials. Since we are called only 640 * as the result of a SET ioctl and only root can do that, any future access 641 * to this "disk" is essentially as root. Note that credentials may change 642 * if some other uid can write directly to the mapped file (NFS). 643 */ 644 int 645 vndsetcred(struct vnd_softc *sc, struct ucred *cred) 646 { 647 void *buf; 648 size_t size; 649 int error; 650 651 sc->sc_cred = crdup(cred); 652 buf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 653 size = MIN(DEV_BSIZE, sc->sc_size * sc->sc_secsize); 654 655 /* XXX: Horrible kludge to establish credentials for NFS */ 656 error = vn_rdwr(UIO_READ, sc->sc_vp, buf, size, 0, UIO_SYSSPACE, 0, 657 sc->sc_cred, NULL, curproc); 658 659 free(buf, M_TEMP, DEV_BSIZE); 660 return (error); 661 } 662 663 void 664 vndclear(struct vnd_softc *sc) 665 { 666 struct vnode *vp = sc->sc_vp; 667 struct proc *p = curproc; /* XXX */ 668 669 DNPRINTF(VDB_FOLLOW, "vndclear(%p): vp %p\n", sc, vp); 670 671 if (vp == NULL) 672 panic("vndioctl: null vp"); 673 (void) vn_close(vp, VNDRW(sc), sc->sc_cred, p); 674 crfree(sc->sc_cred); 675 sc->sc_flags = 0; 676 sc->sc_vp = NULL; 677 sc->sc_cred = NULL; 678 sc->sc_size = 0; 679 memset(sc->sc_file, 0, sizeof(sc->sc_file)); 680 } 681 682 daddr_t 683 vndsize(dev_t dev) 684 { 685 /* We don't support swapping to vnd anymore. */ 686 return (-1); 687 } 688 689 int 690 vnddump(dev_t dev, daddr_t blkno, caddr_t va, size_t size) 691 { 692 /* Not implemented. */ 693 return (ENXIO); 694 } 695