2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/errno.h>
38 #include <sys/endian.h>
39 #include <sys/systm.h>
40 #include <sys/sysctl.h>
41 #include <sys/kernel.h>
42 #include <sys/fcntl.h>
43 #include <sys/malloc.h>
46 #include <sys/mutex.h>
50 #include <sys/diskmbr.h>
52 #include <geom/geom.h>
53 #include <geom/geom_slice.h>
55 FEATURE(geom_mbr, "GEOM DOS/MBR partitioning support");
57 #define MBR_CLASS_NAME "MBR"
58 #define MBREXT_CLASS_NAME "MBREXT"
60 static struct dos_partition historical_bogus_partition_table[NDOSPART] = {
61 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
62 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
63 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
64 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 255, 255, 255, 0, 50000, },
67 static struct dos_partition historical_bogus_partition_table_fixed[NDOSPART] = {
68 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
69 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
70 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
71 { 0x80, 0, 1, 0, DOSPTYP_386BSD, 254, 255, 255, 0, 50000, },
75 g_mbr_print(int i, struct dos_partition *dp)
78 printf("[%d] f:%02x typ:%d", i, dp->dp_flag, dp->dp_typ);
79 printf(" s(CHS):%d/%d/%d", DPCYL(dp->dp_scyl, dp->dp_ssect),
80 dp->dp_shd, DPSECT(dp->dp_ssect));
81 printf(" e(CHS):%d/%d/%d", DPCYL(dp->dp_ecyl, dp->dp_esect),
82 dp->dp_ehd, DPSECT(dp->dp_esect));
83 printf(" s:%d l:%d\n", dp->dp_start, dp->dp_size);
94 * XXX: Add gctl_req arg and give good error msgs.
95 * XXX: Check that length argument does not bring boot code inside any slice.
98 g_mbr_modify(struct g_geom *gp, struct g_mbr_softc *ms, u_char *sec0, int len __unused)
102 struct dos_partition ndp[NDOSPART], *dp;
107 if (sec0[0x1fe] != 0x55 && sec0[0x1ff] != 0xaa)
111 for (i = 0; i < NDOSPART; i++) {
113 sec0 + DOSPARTOFF + i * sizeof(struct dos_partition),
116 if ((!bcmp(dp, historical_bogus_partition_table,
117 sizeof historical_bogus_partition_table)) ||
118 (!bcmp(dp, historical_bogus_partition_table_fixed,
119 sizeof historical_bogus_partition_table_fixed))) {
121 * We will not allow people to write these from "the inside",
122 * Since properly selfdestructing takes too much code. If
123 * people really want to do this, they cannot have any
124 * providers of this geom open, and in that case they can just
125 * as easily overwrite the MBR in the parent device.
129 for (i = 0; i < NDOSPART; i++) {
131 * A Protective MBR (PMBR) has a single partition of
132 * type 0xEE spanning the whole disk. Such a MBR
133 * protects a GPT on the disk from MBR tools that
134 * don't know anything about GPT. We're interpreting
135 * it a bit more loosely: any partition of type 0xEE
136 * is to be skipped as it doesn't contain any data
137 * that we should care about. We still allow other
138 * partitions to be present in the MBR. A PMBR will
139 * be handled correctly anyway.
141 if (dp[i].dp_typ == DOSPTYP_PMBR)
143 else if (dp[i].dp_flag != 0 && dp[i].dp_flag != 0x80)
145 else if (dp[i].dp_typ == 0)
148 l[i] = (off_t)dp[i].dp_size * ms->sectorsize;
149 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
150 (off_t)dp[i].dp_start * ms->sectorsize, l[i],
151 ms->sectorsize, "%ss%d", gp->name, 1 + i);
155 for (i = 0; i < NDOSPART; i++) {
156 ms->type[i] = dp[i].dp_typ;
157 g_slice_config(gp, i, G_SLICE_CONFIG_SET,
158 (off_t)dp[i].dp_start * ms->sectorsize, l[i],
159 ms->sectorsize, "%ss%d", gp->name, 1 + i);
161 bcopy(sec0, ms->sec0, 512);
164 * Calculate MD5 from the first sector and use it for avoiding
165 * recursive slices creation.
168 MD5Update(&md5sum, ms->sec0, sizeof(ms->sec0));
169 MD5Final(ms->slicesum, &md5sum);
175 g_mbr_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
178 struct g_mbr_softc *ms;
179 struct g_slicer *gsp;
180 struct g_consumer *cp;
191 if (!(fflag & FWRITE))
195 cp = LIST_FIRST(&gp->consumer);
197 error = g_access(cp, 0, 1, 0);
202 error = g_mbr_modify(gp, ms, data, 512);
204 error = g_write_data(cp, 0, data, 512);
206 g_access(cp, 0, -1 , 0);
217 g_mbr_start(struct bio *bp)
219 struct g_provider *pp;
221 struct g_mbr_softc *mp;
222 struct g_slicer *gsp;
230 if (bp->bio_cmd == BIO_GETATTR) {
231 if (g_handleattr_int(bp, "MBR::type", mp->type[idx]))
233 if (g_handleattr_off_t(bp, "MBR::offset",
234 gsp->slices[idx].offset))
236 if (g_handleattr(bp, "MBR::slicesum", mp->slicesum,
237 sizeof(mp->slicesum)))
245 g_mbr_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
247 struct g_mbr_softc *mp;
248 struct g_slicer *gsp;
252 g_slice_dumpconf(sb, indent, gp, cp, pp);
255 sbuf_printf(sb, " ty %d", mp->type[pp->index]);
257 sbuf_printf(sb, "%s<type>%d</type>\n", indent,
258 mp->type[pp->index]);
262 static struct g_geom *
263 g_mbr_taste(struct g_class *mp, struct g_provider *pp, int insist)
266 struct g_consumer *cp;
268 struct g_mbr_softc *ms;
269 u_int fwsectors, sectorsize;
274 g_trace(G_T_TOPOLOGY, "mbr_taste(%s,%s)", mp->name, pp->name);
276 if (!strcmp(pp->geom->class->name, MBR_CLASS_NAME))
278 gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_mbr_start);
283 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
286 sectorsize = cp->provider->sectorsize;
287 if (sectorsize < 512)
289 ms->sectorsize = sectorsize;
290 buf = g_read_data(cp, 0, sectorsize, NULL);
295 * Calculate MD5 from the first sector and use it for avoiding
296 * recursive slices creation.
298 bcopy(buf, ms->sec0, 512);
300 MD5Update(&md5sum, ms->sec0, sizeof(ms->sec0));
301 MD5Final(ms->slicesum, &md5sum);
303 error = g_getattr("MBR::slicesum", cp, &hash);
304 if (!error && !bcmp(ms->slicesum, hash, sizeof(hash))) {
310 g_mbr_modify(gp, ms, buf, 512);
316 g_access(cp, -1, 0, 0);
317 if (LIST_EMPTY(&gp->provider)) {
325 g_mbr_config(struct gctl_req *req, struct g_class *mp, const char *verb)
328 struct g_consumer *cp;
329 struct g_mbr_softc *ms;
330 struct g_slicer *gsp;
331 int opened = 0, error = 0;
336 gp = gctl_get_geom(req, mp, "geom");
339 if (strcmp(verb, "write MBR")) {
340 gctl_error(req, "Unknown verb");
345 data = gctl_get_param(req, "data", &len);
348 if (len < 512 || (len % 512)) {
349 gctl_error(req, "Wrong request length");
352 cp = LIST_FIRST(&gp->consumer);
354 error = g_access(cp, 0, 1, 0);
359 error = g_mbr_modify(gp, ms, data, len);
361 gctl_error(req, "conflict with open slices");
363 error = g_write_data(cp, 0, data, len);
365 gctl_error(req, "sector zero write failed");
367 g_access(cp, 0, -1 , 0);
371 static struct g_class g_mbr_class = {
372 .name = MBR_CLASS_NAME,
373 .version = G_VERSION,
374 .taste = g_mbr_taste,
375 .dumpconf = g_mbr_dumpconf,
376 .ctlreq = g_mbr_config,
377 .ioctl = g_mbr_ioctl,
380 DECLARE_GEOM_CLASS(g_mbr_class, g_mbr);
382 #define NDOSEXTPART 32
383 struct g_mbrext_softc {
384 int type [NDOSEXTPART];
388 g_mbrext_start(struct bio *bp)
390 struct g_provider *pp;
392 struct g_mbrext_softc *mp;
393 struct g_slicer *gsp;
401 if (bp->bio_cmd == BIO_GETATTR) {
402 if (g_handleattr_int(bp, "MBR::type", mp->type[idx]))
409 g_mbrext_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
411 struct g_mbrext_softc *mp;
412 struct g_slicer *gsp;
414 g_slice_dumpconf(sb, indent, gp, cp, pp);
419 sbuf_printf(sb, " ty %d", mp->type[pp->index]);
421 sbuf_printf(sb, "%s<type>%d</type>\n", indent,
422 mp->type[pp->index]);
426 static struct g_geom *
427 g_mbrext_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
430 struct g_consumer *cp;
432 struct g_mbrext_softc *ms;
435 struct dos_partition dp[4];
436 u_int fwsectors, sectorsize;
438 g_trace(G_T_TOPOLOGY, "g_mbrext_taste(%s,%s)", mp->name, pp->name);
440 if (strcmp(pp->geom->class->name, MBR_CLASS_NAME))
442 gp = g_slice_new(mp, NDOSEXTPART, pp, &cp, &ms, sizeof *ms,
450 error = g_getattr("MBR::type", cp, &i);
451 if (error || (i != DOSPTYP_EXT && i != DOSPTYP_EXTLBA))
453 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
456 sectorsize = cp->provider->sectorsize;
457 if (sectorsize != 512)
460 buf = g_read_data(cp, off, sectorsize, NULL);
463 if (buf[0x1fe] != 0x55 && buf[0x1ff] != 0xaa) {
467 for (i = 0; i < NDOSPART; i++)
470 i * sizeof(struct dos_partition), dp + i);
472 if (0 && bootverbose) {
473 printf("MBREXT Slice %d on %s:\n",
474 slice + 5, gp->name);
476 g_mbr_print(1, dp + 1);
478 if ((dp[0].dp_flag & 0x7f) == 0 &&
479 dp[0].dp_size != 0 && dp[0].dp_typ != 0) {
481 g_slice_config(gp, slice, G_SLICE_CONFIG_SET,
482 (((off_t)dp[0].dp_start) << 9ULL) + off,
483 ((off_t)dp[0].dp_size) << 9ULL,
486 (int)strlen(gp->name) - 1,
487 (int)strlen(gp->name) - 1,
491 ms->type[slice] = dp[0].dp_typ;
494 if (dp[1].dp_flag != 0)
496 if (dp[1].dp_typ != DOSPTYP_EXT &&
497 dp[1].dp_typ != DOSPTYP_EXTLBA)
499 if (dp[1].dp_size == 0)
501 off = ((off_t)dp[1].dp_start) << 9ULL;
506 g_access(cp, -1, 0, 0);
507 if (LIST_EMPTY(&gp->provider)) {
515 static struct g_class g_mbrext_class = {
516 .name = MBREXT_CLASS_NAME,
517 .version = G_VERSION,
518 .taste = g_mbrext_taste,
519 .dumpconf = g_mbrext_dumpconf,
522 DECLARE_GEOM_CLASS(g_mbrext_class, g_mbrext);