bcd46c600a
is currently conditional on both the GEOM and GEOM_GPT options to
avoid getting GPT by default and having the MBR and GPT classes
clash.
The correct behaviour of the MBR class would be to back-off (reject)
a MBR if it's a Protective MBR (a MBR with a single partition of type
0xEE that spans the whole disk (as far as the MBR is concerned).
The correct behaviour if the GPT class would be to back-off (reject)
a GPT if there's a MBR that's not a Protective MBR.
At this stage it's inconvenient to destroy a good MBR when working
with GPTs that it's more convenient to have the MBR class back-off
when it detects the GPT signature on disk and have the GPT class
ignore the MBR.
In sys/gpt.h UUIDs (GUIDs) for the following FreeBSD partitions
have been defined:
GPT_ENT_TYPE_FREEBSD
FreeBSD slice with disklabel. This is the equivalent of
the well-known FreeBSD MBR partition type.
GPT_ENT_TYPE_FREEBSD_{SWAP|UFS|UFS2|VINUM}
FreeBSD partitions in the context of disklabel. This is
speculating on the idea to use the GPT to hold partitions
instead if slices and removing the fixed (and low) limits
we have on the number of partitions.
This commit lacks a GPT image for the regression suite.
424 lines
11 KiB
C
424 lines
11 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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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. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#ifndef _KERNEL
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/param.h>
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#include <stdlib.h>
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#include <err.h>
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#else
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#endif
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#include <sys/errno.h>
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#include <sys/disklabel.h>
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#include <sys/sbuf.h>
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#include <geom/geom.h>
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#include <geom/geom_slice.h>
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#include "opt_geom.h"
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#define MBR_CLASS_NAME "MBR"
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#define MBREXT_CLASS_NAME "MBREXT"
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static void
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g_dec_dos_partition(u_char *ptr, struct dos_partition *d)
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{
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d->dp_flag = ptr[0];
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d->dp_shd = ptr[1];
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d->dp_ssect = ptr[2];
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d->dp_scyl = ptr[3];
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d->dp_typ = ptr[4];
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d->dp_ehd = ptr[5];
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d->dp_esect = ptr[6];
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d->dp_ecyl = ptr[7];
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d->dp_start = g_dec_le4(ptr + 8);
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d->dp_size = g_dec_le4(ptr + 12);
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}
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#if 0
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static void
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g_enc_dos_partition(u_char *ptr, struct dos_partition *d)
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{
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ptr[0] = d->dp_flag;
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ptr[1] = d->dp_shd;
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ptr[2] = d->dp_ssect;
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ptr[3] = d->dp_scyl;
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ptr[4] = d->dp_typ;
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ptr[5] = d->dp_ehd;
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ptr[6] = d->dp_esect;
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ptr[7] = d->dp_ecyl;
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g_enc_le4(ptr + 8, d->dp_start);
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g_enc_le4(ptr + 12, d->dp_size);
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}
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#endif
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struct g_mbr_softc {
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int type [NDOSPART];
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struct dos_partition dospart[NDOSPART];
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};
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static int
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g_mbr_start(struct bio *bp)
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{
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struct g_provider *pp;
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struct g_geom *gp;
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struct g_mbr_softc *mp;
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struct g_slicer *gsp;
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int index;
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pp = bp->bio_to;
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index = pp->index;
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gp = pp->geom;
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gsp = gp->softc;
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mp = gsp->softc;
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if (bp->bio_cmd == BIO_GETATTR) {
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if (g_haveattr_int(bp, "MBR::type", mp->type[index]))
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return (1);
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}
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return (0);
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}
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static void
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g_mbr_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
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{
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struct g_mbr_softc *mp;
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struct g_slicer *gsp;
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g_slice_dumpconf(sb, indent, gp, cp, pp);
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gsp = gp->softc;
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mp = gsp->softc;
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if (pp != NULL) {
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sbuf_printf(sb, "%s<type>%d</type>\n",
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indent, mp->type[pp->index]);
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}
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}
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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 struct dos_partition historical_bogus_partition_table_fixed[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, 254, 255, 255, 0, 50000, },
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};
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static void
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g_mbr_print(int i __unused, struct dos_partition *dp __unused)
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{
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#if 0
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g_hexdump(dp, sizeof(dp[0]));
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printf("[%d] f:%02x typ:%d", i, dp->dp_flag, dp->dp_typ);
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printf(" s(CHS):%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
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printf(" e(CHS):%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
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printf(" s:%d l:%d\n", dp->dp_start, dp->dp_size);
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#endif
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}
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static struct g_geom *
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g_mbr_taste(struct g_class *mp, struct g_provider *pp, int insist)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_provider *pp2;
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int error, i, npart;
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struct dos_partition dp[NDOSPART];
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struct g_mbr_softc *ms;
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struct g_slicer *gsp;
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u_int fwsectors, sectorsize;
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u_char *buf;
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g_trace(G_T_TOPOLOGY, "mbr_taste(%s,%s)", mp->name, pp->name);
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g_topology_assert();
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gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_mbr_start);
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if (gp == NULL)
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return (NULL);
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gsp = gp->softc;
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g_topology_unlock();
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gp->dumpconf = g_mbr_dumpconf;
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npart = 0;
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while (1) { /* a trick to allow us to use break */
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if (gp->rank != 2 && insist == 0)
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break;
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error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
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if (error)
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fwsectors = 17;
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error = g_getattr("GEOM::sectorsize", cp, §orsize);
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if (error)
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break;
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if (!error && sectorsize != 512)
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break;
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gsp->frontstuff = sectorsize * fwsectors;
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#ifdef GEOM_GPT
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/*
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* XXX: GPT hack: Read the second sector as well and back-off
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* if it has the GPT signature. The ultimate behaviour would
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* be to back-off if we detect a protective MBR (PMBR).
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*/
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buf = g_read_data(cp, 0, 2 * sectorsize, &error);
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#else
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buf = g_read_data(cp, 0, sectorsize, &error);
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#endif
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if (buf == NULL || error != 0)
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break;
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if (buf[0x1fe] != 0x55 && buf[0x1ff] != 0xaa) {
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g_free(buf);
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break;
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}
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#ifdef GEOM_GPT
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if (!memcmp(buf + 512, "EFI PART", 8)) {
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g_free(buf);
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break;
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}
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#endif
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for (i = 0; i < NDOSPART; i++)
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g_dec_dos_partition(
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buf + DOSPARTOFF + i * sizeof(struct dos_partition),
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dp + i);
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g_free(buf);
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if (bcmp(dp, historical_bogus_partition_table,
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sizeof historical_bogus_partition_table) == 0)
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break;
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if (bcmp(dp, historical_bogus_partition_table_fixed,
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sizeof historical_bogus_partition_table_fixed) == 0)
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break;
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npart = 0;
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for (i = 0; i < NDOSPART; i++) {
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if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80)
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continue;
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if (dp[i].dp_size == 0)
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continue;
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g_mbr_print(i, dp + i);
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npart++;
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ms->type[i] = dp[i].dp_typ;
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pp2 = g_slice_addslice(gp, i,
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((off_t)dp[i].dp_start) << 9ULL,
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((off_t)dp[i].dp_size) << 9ULL,
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"%ss%d", gp->name, i + 1);
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}
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break;
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}
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g_topology_lock();
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error = g_access_rel(cp, -1, 0, 0);
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if (npart > 0) {
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g_new_magicspaces(gp, 3);
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g_add_magicspace(gp, 0, "boot", 0, DOSPARTOFF, 0);
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g_add_magicspace(gp, 1, "mbr", DOSPARTOFF, 4 * 16, 0);
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g_add_magicspace(gp, 2, "signature", 510, 2, 0);
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LIST_FOREACH(pp, &gp->provider, provider)
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g_error_provider(pp, 0);
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return (gp);
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}
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g_std_spoiled(cp);
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return (NULL);
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}
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static struct g_class g_mbr_class = {
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MBR_CLASS_NAME,
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g_mbr_taste,
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NULL,
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G_CLASS_INITSTUFF
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};
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DECLARE_GEOM_CLASS(g_mbr_class, g_mbr);
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#define NDOSEXTPART 32
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struct g_mbrext_softc {
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int type [NDOSEXTPART];
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};
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static int
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g_mbrext_start(struct bio *bp)
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{
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struct g_provider *pp;
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struct g_geom *gp;
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struct g_mbrext_softc *mp;
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struct g_slicer *gsp;
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int index;
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pp = bp->bio_to;
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index = pp->index;
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gp = pp->geom;
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gsp = gp->softc;
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mp = gsp->softc;
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if (bp->bio_cmd == BIO_GETATTR) {
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if (g_haveattr_int(bp, "MBR::type", mp->type[index]))
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return (1);
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}
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return (0);
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}
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static void
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g_mbrext_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
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{
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struct g_mbrext_softc *mp;
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struct g_slicer *gsp;
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g_slice_dumpconf(sb, indent, gp, cp, pp);
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gsp = gp->softc;
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mp = gsp->softc;
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if (pp != NULL) {
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sbuf_printf(sb, "%s<type>%d</type>\n",
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indent, mp->type[pp->index]);
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}
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}
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static void
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g_mbrext_print(int i, struct dos_partition *dp)
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{
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g_hexdump(dp, sizeof(dp[0]));
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printf("[%d] f:%02x typ:%d", i, dp->dp_flag, dp->dp_typ);
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printf(" s(CHS):%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
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printf(" e(CHS):%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
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printf(" s:%d l:%d\n", dp->dp_start, dp->dp_size);
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}
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static struct g_geom *
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g_mbrext_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_provider *pp2;
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int error, i, slice;
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struct g_mbrext_softc *ms;
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off_t off;
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u_char *buf;
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struct dos_partition dp[4];
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u_int fwsectors, sectorsize;
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struct g_slicer *gsp;
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g_trace(G_T_TOPOLOGY, "g_mbrext_taste(%s,%s)", mp->name, pp->name);
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g_topology_assert();
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if (strcmp(pp->geom->class->name, MBR_CLASS_NAME))
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return (NULL);
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gp = g_slice_new(mp, NDOSEXTPART, pp, &cp, &ms, sizeof *ms, g_mbrext_start);
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if (gp == NULL)
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return (NULL);
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gsp = gp->softc;
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g_topology_unlock();
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gp->dumpconf = g_mbrext_dumpconf;
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off = 0;
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slice = 0;
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while (1) { /* a trick to allow us to use break */
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error = g_getattr("MBR::type", cp, &i);
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if (error || i != DOSPTYP_EXT)
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break;
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error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
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if (error)
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fwsectors = 17;
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error = g_getattr("GEOM::sectorsize", cp, §orsize);
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if (error)
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break;
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if (!error && sectorsize != 512)
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break;
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gsp->frontstuff = sectorsize * fwsectors;
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for (;;) {
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buf = g_read_data(cp, off, sectorsize, &error);
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if (buf == NULL || error != 0)
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break;
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if (buf[0x1fe] != 0x55 && buf[0x1ff] != 0xaa)
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break;
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for (i = 0; i < NDOSPART; i++)
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g_dec_dos_partition(
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buf + DOSPARTOFF + i * sizeof(struct dos_partition),
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dp + i);
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g_free(buf);
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g_mbrext_print(0, dp);
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g_mbrext_print(1, dp + 1);
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if (dp[0].dp_flag == 0 && dp[0].dp_size != 0) {
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pp2 = g_slice_addslice(gp, slice,
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(((off_t)dp[0].dp_start) << 9ULL) + off,
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((off_t)dp[0].dp_size) << 9ULL,
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"%*.*s%d",
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strlen(gp->name) - 1,
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strlen(gp->name) - 1,
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gp->name,
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slice + 5);
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ms->type[slice] = dp[0].dp_typ;
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slice++;
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g_error_provider(pp2, 0);
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}
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if (dp[1].dp_flag != 0)
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break;
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if (dp[1].dp_typ != DOSPTYP_EXT)
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break;
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if (dp[1].dp_size == 0)
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break;
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off = ((off_t)dp[1].dp_start) << 9ULL;
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}
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break;
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}
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g_topology_lock();
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error = g_access_rel(cp, -1, 0, 0);
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if (slice > 0) {
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/* XXX: add magic spaces */
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return (gp);
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}
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g_topology_assert();
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g_std_spoiled(cp);
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g_topology_assert();
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return (NULL);
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}
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static struct g_class g_mbrext_class = {
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MBREXT_CLASS_NAME,
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g_mbrext_taste,
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NULL,
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G_CLASS_INITSTUFF
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};
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DECLARE_GEOM_CLASS(g_mbrext_class, g_mbrext);
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