469 lines
12 KiB
C
469 lines
12 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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*
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/endian.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/fcntl.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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#include <sys/md5.h>
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#include <sys/diskmbr.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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#define MBR_CLASS_NAME "MBR"
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#define MBREXT_CLASS_NAME "MBREXT"
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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, struct dos_partition *dp)
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{
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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", DPCYL(dp->dp_scyl, dp->dp_ssect),
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dp->dp_shd, DPSECT(dp->dp_ssect));
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printf(" e(CHS):%d/%d/%d", DPCYL(dp->dp_ecyl, dp->dp_esect),
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dp->dp_ehd, DPSECT(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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struct g_mbr_softc {
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int type [NDOSPART];
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u_int sectorsize;
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u_char sec0[512];
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u_char slicesum[16];
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};
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static int
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g_mbr_modify(struct g_geom *gp, struct g_mbr_softc *ms, u_char *sec0)
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{
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int i, error;
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off_t l[NDOSPART];
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struct dos_partition ndp[NDOSPART], *dp;
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MD5_CTX md5sum;
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g_topology_assert();
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if (sec0[0x1fe] != 0x55 && sec0[0x1ff] != 0xaa)
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return (EBUSY);
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dp = ndp;
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for (i = 0; i < NDOSPART; i++) {
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dos_partition_dec(
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sec0 + DOSPARTOFF + i * sizeof(struct dos_partition),
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dp + i);
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if (0 && bootverbose)
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g_mbr_print(i, dp + i);
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}
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if ((!bcmp(dp, historical_bogus_partition_table,
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sizeof historical_bogus_partition_table)) ||
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(!bcmp(dp, historical_bogus_partition_table_fixed,
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sizeof historical_bogus_partition_table_fixed))) {
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/*
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* We will not allow people to write these from "the inside",
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* Since properly selfdestructing takes too much code. If
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* people really want to do this, they cannot have any
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* providers of this geom open, and in that case they can just
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* as easily overwrite the MBR in the parent device.
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*/
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return(EBUSY);
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}
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for (i = 0; i < NDOSPART; i++) {
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/*
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* A Protective MBR (PMBR) has a single partition of
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* type 0xEE spanning the whole disk. Such a MBR
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* protects a GPT on the disk from MBR tools that
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* don't know anything about GPT. We're interpreting
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* it a bit more loosely: any partition of type 0xEE
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* is to be skipped as it doesn't contain any data
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* that we should care about. We still allow other
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* partitions to be present in the MBR. A PMBR will
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* be handled correctly anyway.
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*/
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if (dp[i].dp_typ == DOSPTYP_PMBR)
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l[i] = 0;
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else if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80)
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l[i] = 0;
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else if (dp[i].dp_typ == 0)
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l[i] = 0;
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else
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l[i] = (off_t)dp[i].dp_size * ms->sectorsize;
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error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
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(off_t)dp[i].dp_start * ms->sectorsize, l[i],
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ms->sectorsize, "%ss%d", gp->name, 1 + i);
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if (error)
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return (error);
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}
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for (i = 0; i < NDOSPART; i++) {
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ms->type[i] = dp[i].dp_typ;
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g_slice_config(gp, i, G_SLICE_CONFIG_SET,
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(off_t)dp[i].dp_start * ms->sectorsize, l[i],
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ms->sectorsize, "%ss%d", gp->name, 1 + i);
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}
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bcopy(sec0, ms->sec0, 512);
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/*
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* Calculate MD5 from the first sector and use it for avoiding
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* recursive slices creation.
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*/
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MD5Init(&md5sum);
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MD5Update(&md5sum, ms->sec0, sizeof(ms->sec0));
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MD5Final(ms->slicesum, &md5sum);
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return (0);
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}
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static int
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g_mbr_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
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{
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struct g_geom *gp;
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struct g_mbr_softc *ms;
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struct g_slicer *gsp;
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struct g_consumer *cp;
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int error, opened;
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gp = pp->geom;
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gsp = gp->softc;
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ms = gsp->softc;
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opened = 0;
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error = 0;
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switch(cmd) {
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case DIOCSMBR: {
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if (!(fflag & FWRITE))
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return (EPERM);
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DROP_GIANT();
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g_topology_lock();
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cp = LIST_FIRST(&gp->consumer);
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if (cp->acw == 0) {
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error = g_access(cp, 0, 1, 0);
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if (error == 0)
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opened = 1;
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}
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if (!error)
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error = g_mbr_modify(gp, ms, data);
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if (!error)
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error = g_write_data(cp, 0, data, 512);
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if (opened)
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g_access(cp, 0, -1 , 0);
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g_topology_unlock();
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PICKUP_GIANT();
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return(error);
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}
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default:
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return (ENOIOCTL);
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}
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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 idx;
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pp = bp->bio_to;
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idx = 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_handleattr_int(bp, "MBR::type", mp->type[idx]))
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return (1);
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if (g_handleattr_off_t(bp, "MBR::offset",
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gsp->slices[idx].offset))
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return (1);
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if (g_handleattr(bp, "MBR::slicesum", mp->slicesum,
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sizeof(mp->slicesum)))
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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, const 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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gsp = gp->softc;
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mp = gsp->softc;
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g_slice_dumpconf(sb, indent, gp, cp, pp);
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if (pp != NULL) {
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if (indent == NULL)
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sbuf_printf(sb, " ty %d", mp->type[pp->index]);
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else
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sbuf_printf(sb, "%s<type>%d</type>\n", indent,
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mp->type[pp->index]);
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}
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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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int error;
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struct g_mbr_softc *ms;
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u_int fwsectors, sectorsize;
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u_char *buf;
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u_char hash[16];
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MD5_CTX md5sum;
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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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if (!strcmp(pp->geom->class->name, MBR_CLASS_NAME))
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return (NULL);
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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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g_topology_unlock();
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do {
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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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sectorsize = cp->provider->sectorsize;
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if (sectorsize < 512)
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break;
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ms->sectorsize = sectorsize;
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buf = g_read_data(cp, 0, sectorsize, &error);
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if (buf == NULL || error != 0)
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break;
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/*
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* Calculate MD5 from the first sector and use it for avoiding
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* recursive slices creation.
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*/
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bcopy(buf, ms->sec0, 512);
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MD5Init(&md5sum);
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MD5Update(&md5sum, ms->sec0, sizeof(ms->sec0));
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MD5Final(ms->slicesum, &md5sum);
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error = g_getattr("MBR::slicesum", cp, &hash);
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if (!error && !bcmp(ms->slicesum, hash, sizeof(hash))) {
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g_free(buf);
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break;
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}
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g_topology_lock();
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g_mbr_modify(gp, ms, buf);
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g_topology_unlock();
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g_free(buf);
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break;
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} while (0);
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g_topology_lock();
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g_access(cp, -1, 0, 0);
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if (LIST_EMPTY(&gp->provider)) {
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g_slice_spoiled(cp);
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return (NULL);
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}
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return (gp);
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}
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static struct g_class g_mbr_class = {
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.name = MBR_CLASS_NAME,
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.version = G_VERSION,
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.taste = g_mbr_taste,
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.dumpconf = g_mbr_dumpconf,
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.ioctl = g_mbr_ioctl,
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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 idx;
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pp = bp->bio_to;
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idx = 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_handleattr_int(bp, "MBR::type", mp->type[idx]))
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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, const 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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if (indent == NULL)
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sbuf_printf(sb, " ty %d", mp->type[pp->index]);
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else
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sbuf_printf(sb, "%s<type>%d</type>\n", indent,
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mp->type[pp->index]);
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}
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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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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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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,
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g_mbrext_start);
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if (gp == NULL)
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return (NULL);
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g_topology_unlock();
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off = 0;
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slice = 0;
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do {
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error = g_getattr("MBR::type", cp, &i);
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if (error || (i != DOSPTYP_EXT && i != DOSPTYP_EXTLBA))
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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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sectorsize = cp->provider->sectorsize;
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if (sectorsize != 512)
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break;
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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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g_free(buf);
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break;
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}
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for (i = 0; i < NDOSPART; i++)
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dos_partition_dec(
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buf + DOSPARTOFF +
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i * sizeof(struct dos_partition), dp + i);
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g_free(buf);
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if (0 && bootverbose) {
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printf("MBREXT Slice %d on %s:\n",
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slice + 5, gp->name);
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g_mbr_print(0, dp);
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g_mbr_print(1, dp + 1);
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}
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if ((dp[0].dp_flag & 0x7f) == 0 &&
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dp[0].dp_size != 0 && dp[0].dp_typ != 0) {
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g_topology_lock();
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g_slice_config(gp, slice, G_SLICE_CONFIG_SET,
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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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sectorsize,
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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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g_topology_unlock();
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ms->type[slice] = dp[0].dp_typ;
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slice++;
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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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dp[1].dp_typ != DOSPTYP_EXTLBA)
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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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} while (0);
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g_topology_lock();
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g_access(cp, -1, 0, 0);
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if (LIST_EMPTY(&gp->provider)) {
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g_slice_spoiled(cp);
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return (NULL);
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}
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return (gp);
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}
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static struct g_class g_mbrext_class = {
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.name = MBREXT_CLASS_NAME,
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.version = G_VERSION,
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.taste = g_mbrext_taste,
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.dumpconf = g_mbrext_dumpconf,
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};
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DECLARE_GEOM_CLASS(g_mbrext_class, g_mbrext);
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