a7d783dddb
- ignore the partition table if it is identical with the bogus one in
/usr/src/sys/i386/boot/biosboot/start.S. Honoring the bogus size
field was fatal. The error is detected but other compatibilty
cruft weakens the error handling too much for this case.
- weaken the partition entry checking to allow the following treatments
of C/H/S addresses when C should be >= 1024:
(1) allow C = 1023, H = max, S = max.
(2) allow C to be correct modulo 1024.
Other compatibilty cruft weakens the error handling to allow all
C/H/S addresses, but there too many errors were reported.
Improve error messages:
- print C/H/S addresses if relevant.
- distinguish primary partition table from extended partition tables.
- don't use diskerr() except for i/o errors.
420 lines
12 KiB
C
420 lines
12 KiB
C
/*-
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* Copyright (c) 1994 Bruce D. Evans.
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* All rights reserved.
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*
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* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
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* from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
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* $Id: diskslice_machdep.c,v 1.8 1995/03/15 16:25:08 bde Exp $
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*/
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#include <stddef.h>
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#include <sys/param.h>
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#include <sys/buf.h>
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#include <sys/disklabel.h>
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#define DOSPTYP_EXTENDED 5
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#include <sys/diskslice.h>
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#include <sys/malloc.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#define TRACE(str) do { if (dsi_debug) printf str; } while (0)
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static volatile u_char dsi_debug;
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static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
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{ 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
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};
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static int check_part __P((char *sname, struct dos_partition *dp,
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u_long offset, int nsectors, int ntracks));
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static void extended __P((char *dname, dev_t dev, d_strategy_t *strat,
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struct disklabel *lp, struct diskslices *ssp,
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u_long ext_offset, u_long ext_size,
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u_long base_ext_offset, int nsectors, int ntracks));
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static int
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check_part(sname, dp, offset, nsectors, ntracks)
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char *sname;
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struct dos_partition *dp;
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u_long offset;
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int nsectors;
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int ntracks;
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{
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int chs_ecyl;
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int chs_esect;
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int chs_scyl;
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int chs_ssect;
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int error;
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u_long esector;
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u_long esector1;
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u_long secpercyl;
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u_long ssector;
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u_long ssector1;
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secpercyl = (u_long)nsectors * ntracks;
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chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect);
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chs_ssect = DPSECT(dp->dp_ssect);
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ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl;
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ssector1 = offset + dp->dp_start;
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/*
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* If ssector1 is on a cylinder >= 1024, then ssector can't be right.
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* Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct
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* apart from the cylinder being reduced modulo 1024.
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*/
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if (ssector < ssector1
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&& ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1
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&& chs_scyl == 1023)
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|| (ssector1 - ssector) % (1024 * secpercyl) == 0)) {
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TRACE(("%s: C/H/S start %d/%d/%d, start %lu: allow\n",
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sname, chs_scyl, dp->dp_shd, chs_ssect, ssector1));
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ssector = ssector1;
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}
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chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect);
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chs_esect = DPSECT(dp->dp_esect);
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esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl;
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esector1 = ssector1 + dp->dp_size - 1;
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/* Allow certain bogus C/H/S values for esector, as above. */
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if (esector < esector1
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&& ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1
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&& chs_ecyl == 1023)
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|| (esector1 - esector) % (1024 * secpercyl) == 0)) {
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TRACE(("%s: C/H/S end %d/%d/%d, end %lu: allow\n",
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sname, chs_ecyl, dp->dp_ehd, chs_esect, esector1));
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esector = esector1;
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}
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error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL;
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printf("%s: start %lu, end = %lu, size %lu%s\n",
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sname, ssector1, esector1, dp->dp_size, error ? "" : ": OK");
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if (ssector != ssector1)
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printf("%s: C/H/S start %d/%d/%d (%lu) != start %lu: invalid\n",
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sname, chs_scyl, dp->dp_shd, chs_ssect,
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ssector, ssector1);
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if (esector != esector1)
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printf("%s: C/H/S end %d/%d/%d (%lu) != end %lu: invalid\n",
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sname, chs_ecyl, dp->dp_ehd, chs_esect,
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esector, esector1);
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return (error);
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}
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int
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dsinit(dname, dev, strat, lp, sspp)
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char *dname;
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dev_t dev;
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d_strategy_t *strat;
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struct disklabel *lp;
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struct diskslices **sspp;
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{
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struct buf *bp;
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u_char *cp;
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int dospart;
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struct dos_partition *dp;
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struct dos_partition *dp0;
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int error;
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int max_ncyls;
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int max_nsectors;
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int max_ntracks;
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char partname[2];
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u_long secpercyl;
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int slice;
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char *sname;
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struct diskslice *sp;
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struct diskslices *ssp;
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/*
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* Allocate a dummy slices "struct" and initialize it to contain
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* only an empty compatibility slice (pointing to itself) and a
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* whole disk slice (covering the disk as described by the label).
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* If there is an error, then the dummy struct becomes final.
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*/
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ssp = malloc(offsetof(struct diskslices, dss_slices)
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+ BASE_SLICE * sizeof *sp, M_DEVBUF, M_WAITOK);
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*sspp = ssp;
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ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE;
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ssp->dss_nslices = BASE_SLICE;
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sp = &ssp->dss_slices[0];
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bzero(sp, BASE_SLICE * sizeof *sp);
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sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit;
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/* Read master boot record. */
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bp = geteblk((int)lp->d_secsize);
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bp->b_dev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
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bp->b_blkno = DOSBBSECTOR;
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bp->b_bcount = lp->d_secsize;
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bp->b_flags = B_BUSY | B_READ;
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(*strat)(bp);
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if (biowait(bp) != 0) {
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diskerr(bp, dname, "error reading primary partition table",
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LOG_PRINTF, 0, lp);
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printf("\n");
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error = EIO;
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goto done;
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}
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/* Weakly verify it. */
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cp = bp->b_un.b_addr;
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sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
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partname);
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if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
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printf("%s: invalid primary partition table: no magic\n",
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sname);
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error = EINVAL;
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goto done;
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}
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dp0 = (struct dos_partition *)(cp + DOSPARTOFF);
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if (bcmp(dp0, historical_bogus_partition_table,
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sizeof historical_bogus_partition_table) == 0) {
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TRACE(("%s: invalid primary partition table: historical\n",
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sname));
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error = EINVAL;
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goto done;
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}
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/* Guess the geometry. */
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/*
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* TODO:
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* Perhaps skip entries with 0 size.
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* Perhaps only look at entries of type DOSPTYP_386BSD.
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*/
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max_ncyls = 0;
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max_nsectors = 0;
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max_ntracks = 0;
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for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
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int nsectors;
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int ntracks;
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max_ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect);
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if (max_ncyls < max_ncyls)
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max_ncyls = max_ncyls;
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nsectors = DPSECT(dp->dp_esect);
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if (max_nsectors < nsectors)
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max_nsectors = nsectors;
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ntracks = dp->dp_ehd + 1;
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if (max_ntracks < ntracks)
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max_ntracks = ntracks;
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}
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/* Check the geometry. */
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/*
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* TODO:
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* As above.
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* Check for overlaps.
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* Check against d_secperunit if the latter is reliable.
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*/
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error = 0;
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secpercyl = (u_long)max_nsectors * max_ntracks;
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for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) {
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if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
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&& dp->dp_start == 0 && dp->dp_size == 0)
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continue;
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sname = dsname(dname, dkunit(dev), BASE_SLICE + dospart,
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RAW_PART, partname);
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/*
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* Temporarily ignore errors from this check. We could
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* simplify things by accepting the table eariler if we
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* always ignore errors here. Perhaps we should always
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* accept the table if the magic is right but not let
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* bad entries affect the geometry.
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*/
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check_part(sname, dp, (u_long)0, max_nsectors, max_ntracks);
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}
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if (error != 0)
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goto done;
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/*
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* Accept the DOS partition table.
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* First adjust the label (we have been careful not to change it
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* before we can guarantee success).
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*/
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if (secpercyl != 0) {
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u_long secperunit;
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lp->d_nsectors = max_nsectors;
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lp->d_ntracks = max_ntracks;
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lp->d_secpercyl = secpercyl;
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secperunit = secpercyl * max_ncyls;
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if (lp->d_secperunit < secperunit)
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lp->d_secperunit = secperunit;
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}
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/*
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* Free the dummy slices "struct" and allocate a real new one.
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* Initialize special slices as above.
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*/
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free(ssp, M_DEVBUF);
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ssp = malloc(offsetof(struct diskslices, dss_slices)
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#define MAX_SLICES_SUPPORTED MAX_SLICES /* was (BASE_SLICE + NDOSPART) */
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+ MAX_SLICES_SUPPORTED * sizeof *sp, M_DEVBUF, M_WAITOK);
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*sspp = ssp;
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ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE;
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sp = &ssp->dss_slices[0];
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bzero(sp, MAX_SLICES_SUPPORTED * sizeof *sp);
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sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit;
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/* Initialize normal slices. */
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sp += BASE_SLICE;
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for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) {
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sp->ds_offset = dp->dp_start;
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sp->ds_size = dp->dp_size;
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sp->ds_type = dp->dp_typ;
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#if 0
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lp->d_subtype |= (lp->d_subtype & 3) | dospart
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| DSTYPE_INDOSPART;
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#endif
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}
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ssp->dss_nslices = BASE_SLICE + NDOSPART;
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/* Handle extended partitions. */
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sp -= NDOSPART;
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for (dospart = 0; dospart < NDOSPART; dospart++, sp++)
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if (sp->ds_type == DOSPTYP_EXTENDED)
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extended(dname, bp->b_dev, strat, lp, ssp,
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sp->ds_offset, sp->ds_size, sp->ds_offset,
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max_nsectors, max_ntracks);
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done:
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bp->b_flags = B_INVAL | B_AGE;
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brelse(bp);
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if (error == EINVAL)
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error = 0;
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return (error);
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}
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void
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extended(dname, dev, strat, lp, ssp, ext_offset, ext_size, base_ext_offset,
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nsectors, ntracks)
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char *dname;
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dev_t dev;
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struct disklabel *lp;
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d_strategy_t *strat;
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struct diskslices *ssp;
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u_long ext_offset;
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u_long ext_size;
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u_long base_ext_offset;
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int nsectors;
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int ntracks;
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{
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struct buf *bp;
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u_char *cp;
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int dospart;
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struct dos_partition *dp;
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int end_slice;
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u_long ext_offsets[NDOSPART];
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u_long ext_sizes[NDOSPART];
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char partname[2];
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int slice;
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char *sname;
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struct diskslice *sp;
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/* Read extended boot record. */
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bp = geteblk((int)lp->d_secsize);
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bp->b_dev = dev;
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bp->b_blkno = ext_offset;
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bp->b_bcount = lp->d_secsize;
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bp->b_flags = B_BUSY | B_READ;
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(*strat)(bp);
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if (biowait(bp) != 0) {
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diskerr(bp, dname, "error reading extended partition table",
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LOG_PRINTF, 0, lp);
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printf("\n");
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goto done;
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}
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/* Weakly verify it. */
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cp = bp->b_un.b_addr;
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if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) {
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sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE, RAW_PART,
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partname);
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printf("%s: invalid extended partition table: no magic\n",
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sname);
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goto done;
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}
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for (dospart = 0,
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dp = (struct dos_partition *)(bp->b_un.b_addr + DOSPARTOFF),
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slice = ssp->dss_nslices, sp = &ssp->dss_slices[slice];
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dospart < NDOSPART; dospart++, dp++) {
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ext_sizes[dospart] = 0;
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if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0
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&& dp->dp_start == 0 && dp->dp_size == 0)
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continue;
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if (dp->dp_typ == DOSPTYP_EXTENDED) {
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char buf[32];
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sname = dsname(dname, dkunit(dev), WHOLE_DISK_SLICE,
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RAW_PART, partname);
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strcpy(buf, sname);
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if (strlen(buf) < sizeof buf - 11)
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strcat(buf, "<extended>");
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check_part(buf, dp, base_ext_offset, nsectors,
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ntracks);
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ext_offsets[dospart] = base_ext_offset + dp->dp_start;
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ext_sizes[dospart] = dp->dp_size;
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} else {
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sname = dsname(dname, dkunit(dev), slice, RAW_PART,
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partname);
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check_part(sname, dp, ext_offset, nsectors, ntracks);
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if (slice >= MAX_SLICES) {
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printf("%s: too many slices\n", sname);
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|
slice++;
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continue;
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|
}
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sp->ds_offset = ext_offset + dp->dp_start;
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|
sp->ds_size = dp->dp_size;
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sp->ds_type = dp->dp_typ;
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ssp->dss_nslices++;
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slice++;
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sp++;
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}
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}
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|
|
/* If we found any more slices, recursively find all the subslices. */
|
|
for (dospart = 0; dospart < NDOSPART; dospart++)
|
|
if (ext_sizes[dospart] != 0)
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|
extended(dname, dev, strat, lp, ssp,
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|
ext_offsets[dospart], ext_sizes[dospart],
|
|
base_ext_offset, nsectors, ntracks);
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|
|
done:
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|
bp->b_flags = B_INVAL | B_AGE;
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|
brelse(bp);
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|
}
|