1 /* $OpenBSD: vnd.c,v 1.178 2022/09/01 12:28:53 deraadt 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 proc *p, struct vnode *, struct vnd_ioctl *, 112 struct ucred **); 113 int vndgetdisklabel(dev_t, struct vnd_softc *, struct disklabel *, int); 114 void vndencrypt(struct vnd_softc *, caddr_t, size_t, daddr_t, int); 115 void vndencryptbuf(struct vnd_softc *, struct buf *, int); 116 size_t vndbdevsize(struct vnode *, struct proc *); 117 118 void 119 vndencrypt(struct vnd_softc *sc, caddr_t addr, size_t size, daddr_t off, 120 int encrypt) 121 { 122 int i, bsize; 123 u_char iv[8]; 124 125 bsize = dbtob(1); 126 for (i = 0; i < size/bsize; i++) { 127 memset(iv, 0, sizeof(iv)); 128 memcpy(iv, &off, sizeof(off)); 129 blf_ecb_encrypt(sc->sc_keyctx, iv, sizeof(iv)); 130 if (encrypt) 131 blf_cbc_encrypt(sc->sc_keyctx, iv, addr, bsize); 132 else 133 blf_cbc_decrypt(sc->sc_keyctx, iv, addr, bsize); 134 135 addr += bsize; 136 off++; 137 } 138 } 139 140 void 141 vndencryptbuf(struct vnd_softc *sc, struct buf *bp, int encrypt) 142 { 143 vndencrypt(sc, bp->b_data, bp->b_bcount, bp->b_blkno, encrypt); 144 } 145 146 void 147 vndattach(int num) 148 { 149 char *mem; 150 int i; 151 152 if (num <= 0) 153 return; 154 mem = mallocarray(num, sizeof(struct vnd_softc), M_DEVBUF, 155 M_NOWAIT | M_ZERO); 156 if (mem == NULL) { 157 printf("WARNING: no memory for vnode disks\n"); 158 return; 159 } 160 vnd_softc = (struct vnd_softc *)mem; 161 for (i = 0; i < num; i++) { 162 struct vnd_softc *sc = &vnd_softc[i]; 163 164 sc->sc_dev.dv_unit = i; 165 snprintf(sc->sc_dev.dv_xname, sizeof(sc->sc_dev.dv_xname), 166 "vnd%d", i); 167 disk_construct(&sc->sc_dk); 168 device_ref(&sc->sc_dev); 169 } 170 numvnd = num; 171 } 172 173 int 174 vndopen(dev_t dev, int flags, int mode, struct proc *p) 175 { 176 int unit = DISKUNIT(dev); 177 struct vnd_softc *sc; 178 int error = 0, part; 179 180 DNPRINTF(VDB_FOLLOW, "vndopen(%x, %x, %x, %p)\n", dev, flags, mode, p); 181 182 if (unit >= numvnd) 183 return (ENXIO); 184 sc = &vnd_softc[unit]; 185 186 if ((error = disk_lock(&sc->sc_dk)) != 0) 187 return (error); 188 189 if ((flags & FWRITE) && (sc->sc_flags & VNF_READONLY)) { 190 error = EROFS; 191 goto bad; 192 } 193 194 if ((sc->sc_flags & VNF_INITED) && 195 (sc->sc_flags & VNF_HAVELABEL) == 0 && 196 sc->sc_dk.dk_openmask == 0) { 197 sc->sc_flags |= VNF_HAVELABEL; 198 vndgetdisklabel(dev, sc, sc->sc_dk.dk_label, 0); 199 } 200 201 part = DISKPART(dev); 202 error = disk_openpart(&sc->sc_dk, part, mode, 203 (sc->sc_flags & VNF_HAVELABEL) != 0); 204 205 bad: 206 disk_unlock(&sc->sc_dk); 207 return (error); 208 } 209 210 /* 211 * Load the label information on the named device 212 */ 213 int 214 vndgetdisklabel(dev_t dev, struct vnd_softc *sc, struct disklabel *lp, 215 int spoofonly) 216 { 217 memset(lp, 0, sizeof(struct disklabel)); 218 219 lp->d_secsize = sc->sc_secsize; 220 lp->d_nsectors = sc->sc_nsectors; 221 lp->d_ntracks = sc->sc_ntracks; 222 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 223 if (lp->d_secpercyl) 224 lp->d_ncylinders = sc->sc_size / lp->d_secpercyl; 225 226 strncpy(lp->d_typename, "vnd device", sizeof(lp->d_typename)); 227 lp->d_type = DTYPE_VND; 228 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 229 DL_SETDSIZE(lp, sc->sc_size); 230 lp->d_flags = 0; 231 lp->d_version = 1; 232 233 lp->d_magic = DISKMAGIC; 234 lp->d_magic2 = DISKMAGIC; 235 lp->d_checksum = dkcksum(lp); 236 237 /* Call the generic disklabel extraction routine */ 238 return readdisklabel(DISKLABELDEV(dev), vndstrategy, lp, spoofonly); 239 } 240 241 int 242 vndclose(dev_t dev, int flags, int mode, struct proc *p) 243 { 244 int unit = DISKUNIT(dev); 245 struct vnd_softc *sc; 246 int part; 247 248 DNPRINTF(VDB_FOLLOW, "vndclose(%x, %x, %x, %p)\n", dev, flags, mode, p); 249 250 if (unit >= numvnd) 251 return (ENXIO); 252 sc = &vnd_softc[unit]; 253 254 disk_lock_nointr(&sc->sc_dk); 255 256 part = DISKPART(dev); 257 258 disk_closepart(&sc->sc_dk, part, mode); 259 260 #if 0 261 if (sc->sc_dk.dk_openmask == 0) 262 sc->sc_flags &= ~VNF_HAVELABEL; 263 #endif 264 265 disk_unlock(&sc->sc_dk); 266 return (0); 267 } 268 269 void 270 vndstrategy(struct buf *bp) 271 { 272 int unit = DISKUNIT(bp->b_dev); 273 struct vnd_softc *sc; 274 struct partition *p; 275 off_t off; 276 long origbcount; 277 int s; 278 279 DNPRINTF(VDB_FOLLOW, "vndstrategy(%p): unit %d\n", bp, unit); 280 281 if (unit >= numvnd) { 282 bp->b_error = ENXIO; 283 goto bad; 284 } 285 sc = &vnd_softc[unit]; 286 287 if ((sc->sc_flags & VNF_HAVELABEL) == 0) { 288 bp->b_error = ENXIO; 289 goto bad; 290 } 291 292 /* 293 * Many of the distrib scripts assume they can issue arbitrary 294 * sized requests to raw vnd devices irrespective of the 295 * emulated disk geometry. 296 * 297 * To continue supporting this, round the block count up to a 298 * multiple of d_secsize for bounds_check_with_label(), and 299 * then restore afterwards. 300 * 301 * We only do this for non-encrypted vnd, because encryption 302 * requires operating on blocks at a time. 303 */ 304 origbcount = bp->b_bcount; 305 if (sc->sc_keyctx == NULL) { 306 u_int32_t secsize = sc->sc_dk.dk_label->d_secsize; 307 bp->b_bcount = ((origbcount + secsize - 1) & ~(secsize - 1)); 308 #ifdef DIAGNOSTIC 309 if (bp->b_bcount != origbcount) { 310 struct process *curpr = curproc->p_p; 311 printf("%s: sloppy %s from proc %d (%s): " 312 "blkno %lld bcount %ld\n", sc->sc_dev.dv_xname, 313 (bp->b_flags & B_READ) ? "read" : "write", 314 curpr->ps_pid, curpr->ps_comm, 315 (long long)bp->b_blkno, origbcount); 316 } 317 #endif 318 } 319 320 if (bounds_check_with_label(bp, sc->sc_dk.dk_label) == -1) { 321 bp->b_resid = bp->b_bcount = origbcount; 322 goto done; 323 } 324 325 if (origbcount < bp->b_bcount) 326 bp->b_bcount = origbcount; 327 328 p = &sc->sc_dk.dk_label->d_partitions[DISKPART(bp->b_dev)]; 329 off = DL_GETPOFFSET(p) * sc->sc_dk.dk_label->d_secsize + 330 (u_int64_t)bp->b_blkno * DEV_BSIZE; 331 332 if (sc->sc_keyctx && !(bp->b_flags & B_READ)) 333 vndencryptbuf(sc, bp, 1); 334 335 /* 336 * Use IO_NOLIMIT because upper layer has already checked I/O 337 * for limits, so there is no need to do it again. 338 * 339 * We use IO_NOCACHE because this data should be cached at the 340 * upper layer, so there is no need to cache it again. 341 */ 342 bp->b_error = vn_rdwr((bp->b_flags & B_READ) ? UIO_READ : UIO_WRITE, 343 sc->sc_vp, bp->b_data, bp->b_bcount, off, UIO_SYSSPACE, 344 IO_NOCACHE | IO_SYNC | IO_NOLIMIT, sc->sc_cred, &bp->b_resid, curproc); 345 if (bp->b_error) 346 bp->b_flags |= B_ERROR; 347 348 /* Data in buffer cache needs to be in clear */ 349 if (sc->sc_keyctx) 350 vndencryptbuf(sc, bp, 0); 351 352 goto done; 353 354 bad: 355 bp->b_flags |= B_ERROR; 356 bp->b_resid = bp->b_bcount; 357 done: 358 s = splbio(); 359 biodone(bp); 360 splx(s); 361 } 362 363 /* ARGSUSED */ 364 int 365 vndread(dev_t dev, struct uio *uio, int flags) 366 { 367 return (physio(vndstrategy, dev, B_READ, minphys, uio)); 368 } 369 370 /* ARGSUSED */ 371 int 372 vndwrite(dev_t dev, struct uio *uio, int flags) 373 { 374 return (physio(vndstrategy, dev, B_WRITE, minphys, uio)); 375 } 376 377 size_t 378 vndbdevsize(struct vnode *vp, struct proc *p) 379 { 380 struct partinfo pi; 381 struct bdevsw *bsw; 382 dev_t dev; 383 384 dev = vp->v_rdev; 385 bsw = bdevsw_lookup(dev); 386 if (bsw->d_ioctl == NULL) 387 return (0); 388 if (bsw->d_ioctl(dev, DIOCGPART, (caddr_t)&pi, FREAD, p)) 389 return (0); 390 DNPRINTF(VDB_INIT, "vndbdevsize: size %llu secsize %u\n", 391 DL_GETPSIZE(pi.part), pi.disklab->d_secsize); 392 return (DL_GETPSIZE(pi.part)); 393 } 394 395 /* ARGSUSED */ 396 int 397 vndioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 398 { 399 int unit = DISKUNIT(dev); 400 struct disklabel *lp; 401 struct vnd_softc *sc; 402 struct vnd_ioctl *vio; 403 struct vnd_user *vnu; 404 struct vattr vattr; 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 { 422 char name[VNDNLEN], key[BLF_MAXUTILIZED]; 423 struct nameidata nd; 424 struct ucred *cred = NULL; 425 size_t size; 426 int vplocked; 427 int rw; 428 429 if (sc->sc_flags & VNF_INITED) 430 return (EBUSY); 431 432 /* Geometry eventually has to fit into label fields */ 433 if (vio->vnd_secsize > UINT_MAX || 434 vio->vnd_secsize == 0 || 435 vio->vnd_ntracks > UINT_MAX || 436 vio->vnd_nsectors > UINT_MAX) 437 return (EINVAL); 438 439 if ((error = copyinstr(vio->vnd_file, name, 440 sizeof(name), NULL))) 441 return (error); 442 443 if (vio->vnd_keylen > 0) { 444 if (vio->vnd_keylen > sizeof(key)) 445 vio->vnd_keylen = sizeof(key); 446 447 if ((error = copyin(vio->vnd_key, key, 448 vio->vnd_keylen)) != 0) 449 return (error); 450 } 451 452 /* 453 * Open for read and write first. This lets vn_open() weed out 454 * directories, sockets, etc. so we don't have to worry about 455 * them. 456 */ 457 NDINIT(&nd, 0, 0, UIO_SYSSPACE, name, p); 458 nd.ni_unveil = UNVEIL_READ | UNVEIL_WRITE; 459 rw = FREAD|FWRITE; 460 error = vn_open(&nd, FREAD|FWRITE, 0); 461 if (error == EROFS) { 462 NDINIT(&nd, 0, 0, UIO_SYSSPACE, name, p); 463 nd.ni_unveil = UNVEIL_READ | UNVEIL_WRITE; 464 rw = FREAD; 465 error = vn_open(&nd, FREAD, 0); 466 } 467 if (error) 468 return (error); 469 vplocked = 1; 470 471 error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p); 472 if (error) { 473 fail: 474 if (vplocked) 475 VOP_UNLOCK(nd.ni_vp); 476 vn_close(nd.ni_vp, rw, p->p_ucred, p); 477 if (cred != NULL) 478 crfree(cred); 479 return (error); 480 } 481 482 /* Cannot put a vnd on top of a vnd */ 483 if (major(vattr.va_fsid) == major(dev)) { 484 error = EINVAL; 485 goto fail; 486 } 487 488 if ((error = vndsetcred(p, nd.ni_vp, vio, &cred)) != 0) 489 goto fail; 490 491 VOP_UNLOCK(nd.ni_vp); 492 vplocked = 0; 493 494 if (nd.ni_vp->v_type == VBLK) { 495 size = vndbdevsize(nd.ni_vp, p); 496 /* XXX is size 0 ok? */ 497 } else 498 size = vattr.va_size / vio->vnd_secsize; 499 500 if ((error = disk_lock(&sc->sc_dk)) != 0) 501 goto fail; 502 if (sc->sc_flags & VNF_INITED) { 503 disk_unlock(&sc->sc_dk); 504 error = EBUSY; 505 goto fail; 506 } 507 508 /* Set geometry for device. */ 509 sc->sc_secsize = vio->vnd_secsize; 510 sc->sc_ntracks = vio->vnd_ntracks; 511 sc->sc_nsectors = vio->vnd_nsectors; 512 sc->sc_size = size; 513 514 if (rw == FREAD) 515 sc->sc_flags |= VNF_READONLY; 516 else 517 sc->sc_flags &= ~VNF_READONLY; 518 519 memcpy(sc->sc_file, name, sizeof(sc->sc_file)); 520 521 if (vio->vnd_keylen > 0) { 522 sc->sc_keyctx = malloc(sizeof(*sc->sc_keyctx), M_DEVBUF, 523 M_WAITOK); 524 blf_key(sc->sc_keyctx, key, vio->vnd_keylen); 525 explicit_bzero(key, vio->vnd_keylen); 526 } else 527 sc->sc_keyctx = NULL; 528 529 sc->sc_vp = nd.ni_vp; 530 sc->sc_cred = cred; 531 vio->vnd_size = sc->sc_size * sc->sc_secsize; 532 sc->sc_flags |= VNF_INITED; 533 534 DNPRINTF(VDB_INIT, "vndioctl: SET vp %p size %llx\n", 535 sc->sc_vp, (unsigned long long)sc->sc_size); 536 537 /* Attach the disk. */ 538 sc->sc_dk.dk_name = sc->sc_dev.dv_xname; 539 disk_attach(&sc->sc_dev, &sc->sc_dk); 540 541 disk_unlock(&sc->sc_dk); 542 543 break; 544 } 545 case VNDIOCCLR: 546 if ((error = disk_lock(&sc->sc_dk)) != 0) 547 return (error); 548 if ((sc->sc_flags & VNF_INITED) == 0) { 549 disk_unlock(&sc->sc_dk); 550 return (ENXIO); 551 } 552 553 /* 554 * Don't unconfigure if any other partitions are open 555 * or if both the character and block flavors of this 556 * partition are open. 557 */ 558 part = DISKPART(dev); 559 pmask = (1 << part); 560 if ((sc->sc_dk.dk_openmask & ~pmask) || 561 ((sc->sc_dk.dk_bopenmask & pmask) && 562 (sc->sc_dk.dk_copenmask & pmask))) { 563 disk_unlock(&sc->sc_dk); 564 return (EBUSY); 565 } 566 567 vndclear(sc); 568 DNPRINTF(VDB_INIT, "vndioctl: CLRed\n"); 569 570 /* Free crypto key */ 571 if (sc->sc_keyctx) { 572 explicit_bzero(sc->sc_keyctx, sizeof(*sc->sc_keyctx)); 573 free(sc->sc_keyctx, M_DEVBUF, sizeof(*sc->sc_keyctx)); 574 } 575 576 /* Detach the disk. */ 577 disk_detach(&sc->sc_dk); 578 disk_unlock(&sc->sc_dk); 579 break; 580 581 case VNDIOCGET: 582 vnu = (struct vnd_user *)addr; 583 584 if (vnu->vnu_unit == -1) 585 vnu->vnu_unit = unit; 586 if (vnu->vnu_unit >= numvnd) 587 return (ENXIO); 588 if (vnu->vnu_unit < 0) 589 return (EINVAL); 590 591 sc = &vnd_softc[vnu->vnu_unit]; 592 593 if (sc->sc_flags & VNF_INITED) { 594 error = VOP_GETATTR(sc->sc_vp, &vattr, p->p_ucred, p); 595 if (error) 596 return (error); 597 598 strlcpy(vnu->vnu_file, sc->sc_file, 599 sizeof(vnu->vnu_file)); 600 vnu->vnu_dev = vattr.va_fsid; 601 vnu->vnu_ino = vattr.va_fileid; 602 } else { 603 vnu->vnu_dev = 0; 604 vnu->vnu_ino = 0; 605 } 606 607 break; 608 609 case DIOCRLDINFO: 610 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 611 return (ENOTTY); 612 lp = malloc(sizeof(*lp), M_TEMP, M_WAITOK); 613 vndgetdisklabel(dev, sc, lp, 0); 614 *(sc->sc_dk.dk_label) = *lp; 615 free(lp, M_TEMP, sizeof(*lp)); 616 return (0); 617 618 case DIOCGPDINFO: 619 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 620 return (ENOTTY); 621 vndgetdisklabel(dev, sc, (struct disklabel *)addr, 1); 622 return (0); 623 624 case DIOCGDINFO: 625 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 626 return (ENOTTY); 627 *(struct disklabel *)addr = *(sc->sc_dk.dk_label); 628 return (0); 629 630 case DIOCGPART: 631 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 632 return (ENOTTY); 633 ((struct partinfo *)addr)->disklab = sc->sc_dk.dk_label; 634 ((struct partinfo *)addr)->part = 635 &sc->sc_dk.dk_label->d_partitions[DISKPART(dev)]; 636 return (0); 637 638 case DIOCWDINFO: 639 case DIOCSDINFO: 640 if ((sc->sc_flags & VNF_HAVELABEL) == 0) 641 return (ENOTTY); 642 if ((flag & FWRITE) == 0) 643 return (EBADF); 644 645 if ((error = disk_lock(&sc->sc_dk)) != 0) 646 return (error); 647 648 error = setdisklabel(sc->sc_dk.dk_label, 649 (struct disklabel *)addr, /* sc->sc_dk.dk_openmask */ 0); 650 if (error == 0) { 651 if (cmd == DIOCWDINFO) 652 error = writedisklabel(DISKLABELDEV(dev), 653 vndstrategy, sc->sc_dk.dk_label); 654 } 655 656 disk_unlock(&sc->sc_dk); 657 return (error); 658 659 default: 660 return (ENOTTY); 661 } 662 663 return (0); 664 } 665 666 /* 667 * Duplicate the current processes' credentials. Since we are called only 668 * as the result of a SET ioctl and only root can do that, any future access 669 * to this "disk" is essentially as root. Note that credentials may change 670 * if some other uid can write directly to the mapped file (NFS). 671 */ 672 int 673 vndsetcred(struct proc *p, struct vnode *vp, struct vnd_ioctl *vio, 674 struct ucred **newcredp) 675 { 676 void *buf; 677 size_t size; 678 struct ucred *new; 679 int error; 680 681 new = crdup(p->p_ucred); 682 buf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); 683 size = DEV_BSIZE; 684 685 /* XXX: Horrible kludge to establish credentials for NFS */ 686 error = vn_rdwr(UIO_READ, vp, buf, size, 0, UIO_SYSSPACE, 0, 687 new, NULL, curproc); 688 689 free(buf, M_TEMP, DEV_BSIZE); 690 if (error == 0) 691 *newcredp = new; 692 else 693 crfree(new); 694 return (error); 695 } 696 697 void 698 vndclear(struct vnd_softc *sc) 699 { 700 struct vnode *vp = sc->sc_vp; 701 struct proc *p = curproc; /* XXX */ 702 703 DNPRINTF(VDB_FOLLOW, "vndclear(%p): vp %p\n", sc, vp); 704 705 if (vp == NULL) 706 panic("vndioctl: null vp"); 707 (void) vn_close(vp, VNDRW(sc), sc->sc_cred, p); 708 crfree(sc->sc_cred); 709 sc->sc_flags = 0; 710 sc->sc_vp = NULL; 711 sc->sc_cred = NULL; 712 sc->sc_size = 0; 713 memset(sc->sc_file, 0, sizeof(sc->sc_file)); 714 } 715 716 daddr_t 717 vndsize(dev_t dev) 718 { 719 /* We don't support swapping to vnd anymore. */ 720 return (-1); 721 } 722 723 int 724 vnddump(dev_t dev, daddr_t blkno, caddr_t va, size_t size) 725 { 726 /* Not implemented. */ 727 return (ENXIO); 728 } 729