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))
194 cp = LIST_FIRST(&gp->consumer);
196 error = g_access(cp, 0, 1, 0);
201 error = g_mbr_modify(gp, ms, data, 512);
203 error = g_write_data(cp, 0, data, 512);
205 g_access(cp, 0, -1 , 0);
215 g_mbr_start(struct bio *bp)
217 struct g_provider *pp;
219 struct g_mbr_softc *mp;
220 struct g_slicer *gsp;
228 if (bp->bio_cmd == BIO_GETATTR) {
229 if (g_handleattr_int(bp, "MBR::type", mp->type[idx]))
231 if (g_handleattr_off_t(bp, "MBR::offset",
232 gsp->slices[idx].offset))
234 if (g_handleattr(bp, "MBR::slicesum", mp->slicesum,
235 sizeof(mp->slicesum)))
243 g_mbr_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
245 struct g_mbr_softc *mp;
246 struct g_slicer *gsp;
250 g_slice_dumpconf(sb, indent, gp, cp, pp);
253 sbuf_printf(sb, " ty %d", mp->type[pp->index]);
255 sbuf_printf(sb, "%s<type>%d</type>\n", indent,
256 mp->type[pp->index]);
260 static struct g_geom *
261 g_mbr_taste(struct g_class *mp, struct g_provider *pp, int insist)
264 struct g_consumer *cp;
266 struct g_mbr_softc *ms;
267 u_int fwsectors, sectorsize;
272 g_trace(G_T_TOPOLOGY, "mbr_taste(%s,%s)", mp->name, pp->name);
274 if (!strcmp(pp->geom->class->name, MBR_CLASS_NAME))
276 gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_mbr_start);
281 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
284 sectorsize = cp->provider->sectorsize;
285 if (sectorsize < 512)
287 ms->sectorsize = sectorsize;
288 buf = g_read_data(cp, 0, sectorsize, NULL);
293 * Calculate MD5 from the first sector and use it for avoiding
294 * recursive slices creation.
296 bcopy(buf, ms->sec0, 512);
298 MD5Update(&md5sum, ms->sec0, sizeof(ms->sec0));
299 MD5Final(ms->slicesum, &md5sum);
301 error = g_getattr("MBR::slicesum", cp, &hash);
302 if (!error && !bcmp(ms->slicesum, hash, sizeof(hash))) {
308 g_mbr_modify(gp, ms, buf, 512);
314 g_access(cp, -1, 0, 0);
315 if (LIST_EMPTY(&gp->provider)) {
323 g_mbr_config(struct gctl_req *req, struct g_class *mp, const char *verb)
326 struct g_consumer *cp;
327 struct g_mbr_softc *ms;
328 struct g_slicer *gsp;
329 int opened = 0, error = 0;
334 gp = gctl_get_geom(req, mp, "geom");
337 if (strcmp(verb, "write MBR")) {
338 gctl_error(req, "Unknown verb");
343 data = gctl_get_param(req, "data", &len);
346 if (len < 512 || (len % 512)) {
347 gctl_error(req, "Wrong request length");
350 cp = LIST_FIRST(&gp->consumer);
352 error = g_access(cp, 0, 1, 0);
357 error = g_mbr_modify(gp, ms, data, len);
359 gctl_error(req, "conflict with open slices");
361 error = g_write_data(cp, 0, data, len);
363 gctl_error(req, "sector zero write failed");
365 g_access(cp, 0, -1 , 0);
369 static struct g_class g_mbr_class = {
370 .name = MBR_CLASS_NAME,
371 .version = G_VERSION,
372 .taste = g_mbr_taste,
373 .dumpconf = g_mbr_dumpconf,
374 .ctlreq = g_mbr_config,
375 .ioctl = g_mbr_ioctl,
378 DECLARE_GEOM_CLASS(g_mbr_class, g_mbr);
380 #define NDOSEXTPART 32
381 struct g_mbrext_softc {
382 int type [NDOSEXTPART];
386 g_mbrext_start(struct bio *bp)
388 struct g_provider *pp;
390 struct g_mbrext_softc *mp;
391 struct g_slicer *gsp;
399 if (bp->bio_cmd == BIO_GETATTR) {
400 if (g_handleattr_int(bp, "MBR::type", mp->type[idx]))
407 g_mbrext_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
409 struct g_mbrext_softc *mp;
410 struct g_slicer *gsp;
412 g_slice_dumpconf(sb, indent, gp, cp, pp);
417 sbuf_printf(sb, " ty %d", mp->type[pp->index]);
419 sbuf_printf(sb, "%s<type>%d</type>\n", indent,
420 mp->type[pp->index]);
424 static struct g_geom *
425 g_mbrext_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
428 struct g_consumer *cp;
430 struct g_mbrext_softc *ms;
433 struct dos_partition dp[4];
434 u_int fwsectors, sectorsize;
436 g_trace(G_T_TOPOLOGY, "g_mbrext_taste(%s,%s)", mp->name, pp->name);
438 if (strcmp(pp->geom->class->name, MBR_CLASS_NAME))
440 gp = g_slice_new(mp, NDOSEXTPART, pp, &cp, &ms, sizeof *ms,
448 error = g_getattr("MBR::type", cp, &i);
449 if (error || (i != DOSPTYP_EXT && i != DOSPTYP_EXTLBA))
451 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
454 sectorsize = cp->provider->sectorsize;
455 if (sectorsize != 512)
458 buf = g_read_data(cp, off, sectorsize, NULL);
461 if (buf[0x1fe] != 0x55 && buf[0x1ff] != 0xaa) {
465 for (i = 0; i < NDOSPART; i++)
468 i * sizeof(struct dos_partition), dp + i);
470 if (0 && bootverbose) {
471 printf("MBREXT Slice %d on %s:\n",
472 slice + 5, gp->name);
474 g_mbr_print(1, dp + 1);
476 if ((dp[0].dp_flag & 0x7f) == 0 &&
477 dp[0].dp_size != 0 && dp[0].dp_typ != 0) {
479 g_slice_config(gp, slice, G_SLICE_CONFIG_SET,
480 (((off_t)dp[0].dp_start) << 9ULL) + off,
481 ((off_t)dp[0].dp_size) << 9ULL,
484 (int)strlen(gp->name) - 1,
485 (int)strlen(gp->name) - 1,
489 ms->type[slice] = dp[0].dp_typ;
492 if (dp[1].dp_flag != 0)
494 if (dp[1].dp_typ != DOSPTYP_EXT &&
495 dp[1].dp_typ != DOSPTYP_EXTLBA)
497 if (dp[1].dp_size == 0)
499 off = ((off_t)dp[1].dp_start) << 9ULL;
504 g_access(cp, -1, 0, 0);
505 if (LIST_EMPTY(&gp->provider)) {
513 static struct g_class g_mbrext_class = {
514 .name = MBREXT_CLASS_NAME,
515 .version = G_VERSION,
516 .taste = g_mbrext_taste,
517 .dumpconf = g_mbrext_dumpconf,
520 DECLARE_GEOM_CLASS(g_mbrext_class, g_mbrext);