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2009-12-21 Robert Millan <rmh.grub@aybabtu.com>

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* util/mkisofs/msdos_partition.h: New file (based on
        include/grub/msdos_partition.h).
        * util/mkisofs/mkisofs.c (use_protective_msdos_label): New variable.
        (OPTION_PROTECTIVE_MSDOS_LABEL): New macro.
        (ld_options, main): Recognize --protective-msdos-label.
        * util/mkisofs/mkisofs.h (use_protective_msdos_label): New declaration.
        * util/mkisofs/write.c: Include `"msdos_partition.h"'.
        (padblock_write): If `use_protective_msdos_label' is set, patch a
        protective DOS-style label in the output image.

        * util/grub-mkrescue.in: Use --protective-msdos-label.
This commit is contained in:
Robert Millan 2009-12-21 20:22:12 +00:00
parent e930981361
commit 9b214e3a53
6 changed files with 129 additions and 6 deletions
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14
ChangeLog
View file

@ -1,3 +1,17 @@
2009-12-21 Robert Millan <rmh.grub@aybabtu.com>
* util/mkisofs/msdos_partition.h: New file (based on
include/grub/msdos_partition.h).
* util/mkisofs/mkisofs.c (use_protective_msdos_label): New variable.
(OPTION_PROTECTIVE_MSDOS_LABEL): New macro.
(ld_options, main): Recognize --protective-msdos-label.
* util/mkisofs/mkisofs.h (use_protective_msdos_label): New declaration.
* util/mkisofs/write.c: Include `"msdos_partition.h"'.
(padblock_write): If `use_protective_msdos_label' is set, patch a
protective DOS-style label in the output image.
* util/grub-mkrescue.in: Use --protective-msdos-label.
2009-12-21 Robert Millan <rmh.grub@aybabtu.com>
* util/grub-mkrescue.in: Do not zero-pad image for BIOS-based disk

2
util/grub-mkrescue.in
View file

@ -180,7 +180,7 @@ if test -e "${pc_dir}" ; then
fi
# build iso image
grub-mkisofs ${grub_mkisofs_arguments} -o ${output_image} -r ${iso9660_dir} ${source}
grub-mkisofs ${grub_mkisofs_arguments} --protective-msdos-label -o ${output_image} -r ${iso9660_dir} ${source}
rm -rf ${iso9660_dir}
rm -f ${embed_img}

10
util/mkisofs/mkisofs.c
View file

@ -91,6 +91,7 @@ int extension_record_size = 0;
int use_eltorito = 0;
int use_eltorito_emul_floppy = 0;
int use_embedded_boot = 0;
int use_protective_msdos_label = 0;
int use_boot_info_table = 0;
int use_RockRidge = 0;
int use_Joliet = 0;
@ -199,6 +200,8 @@ struct ld_option
#define OPTION_VERSION 173
#define OPTION_PROTECTIVE_MSDOS_LABEL 174
static const struct ld_option ld_options[] =
{
{ {"all-files", no_argument, NULL, 'a'},
@ -213,6 +216,8 @@ static const struct ld_option ld_options[] =
'\0', N_("FILE"), N_("Set Copyright filename"), ONE_DASH },
{ {"embedded-boot", required_argument, NULL, 'G'},
'G', N_("FILE"), N_("Set embedded boot image name"), TWO_DASHES },
{ {"protective-msdos-label", no_argument, NULL, OPTION_PROTECTIVE_MSDOS_LABEL },
'\0', NULL, N_("Patch a protective DOS-style label in the image"), TWO_DASHES },
{ {"eltorito-boot", required_argument, NULL, 'b'},
'b', N_("FILE"), N_("Set El Torito boot image name"), ONE_DASH },
{ {"eltorito-catalog", required_argument, NULL, 'c'},
@ -726,11 +731,14 @@ int FDECL2(main, int, argc, char **, argv){
error (1, 0, _("Required boot image pathname missing"));
break;
case 'G':
use_embedded_boot++;
use_embedded_boot = 1;
boot_image_embed = optarg; /* pathname of the boot image on host filesystem */
if (boot_image_embed == NULL)
error (1, 0, _("Required boot image pathname missing"));
break;
case OPTION_PROTECTIVE_MSDOS_LABEL:
use_protective_msdos_label = 1;
break;
case 'c':
use_eltorito++;
boot_catalog = optarg; /* pathname of the boot image on cd */

1
util/mkisofs/mkisofs.h
View file

@ -297,6 +297,7 @@ extern struct iso_directory_record jroot_record;
extern int use_eltorito;
extern int use_embedded_boot;
extern int use_protective_msdos_label;
extern int use_eltorito_emul_floppy;
extern int use_boot_info_table;
extern int use_RockRidge;

75
util/mkisofs/msdos_partition.h Normal file
View file

@ -0,0 +1,75 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2004,2007 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MSDOS_PARTITION_H
#define MSDOS_PARTITION_H 1
#include <stdint.h>
/* The signature. */
#define MSDOS_PARTITION_SIGNATURE ((0xaa << 8) | 0x55)
/* This is not a flag actually, but used as if it were a flag. */
#define MSDOS_PARTITION_TYPE_HIDDEN_FLAG 0x10
/* The partition entry. */
struct msdos_partition_entry
{
/* If active, 0x80, otherwise, 0x00. */
uint8_t flag;
/* The head of the start. */
uint8_t start_head;
/* (S | ((C >> 2) & 0xC0)) where S is the sector of the start and C
is the cylinder of the start. Note that S is counted from one. */
uint8_t start_sector;
/* (C & 0xFF) where C is the cylinder of the start. */
uint8_t start_cylinder;
/* The partition type. */
uint8_t type;
/* The end versions of start_head, start_sector and start_cylinder,
respectively. */
uint8_t end_head;
uint8_t end_sector;
uint8_t end_cylinder;
/* The start sector. Note that this is counted from zero. */
uint32_t start;
/* The length in sector units. */
uint32_t length;
} __attribute__ ((packed));
/* The structure of MBR. */
struct msdos_partition_mbr
{
/* The code area (actually, including BPB). */
uint8_t code[446];
/* Four partition entries. */
struct msdos_partition_entry entries[4];
/* The signature 0xaa55. */
uint16_t signature;
} __attribute__ ((packed));
#endif

33
util/mkisofs/write.c
View file

@ -21,11 +21,10 @@
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include "config.h"
#include "mkisofs.h"
#include "iso9660.h"
#include <time.h>
#include <errno.h>
@ -38,6 +37,10 @@
#include <unistd.h>
#endif
#include "mkisofs.h"
#include "iso9660.h"
#include "msdos_partition.h"
#ifdef __SVR4
extern char * strdup(const char *);
#endif
@ -1424,7 +1427,6 @@ static int FDECL1(dirtree_cleanup, FILE *, outfile)
static int FDECL1(padblock_write, FILE *, outfile)
{
char *buffer;
int i;
buffer = e_malloc (2048 * PADBLOCK_SIZE);
memset (buffer, 0, 2048 * PADBLOCK_SIZE);
@ -1437,6 +1439,29 @@ static int FDECL1(padblock_write, FILE *, outfile)
fread (buffer, 2048 * PADBLOCK_SIZE, 1, fp);
}
if (use_protective_msdos_label)
{
struct msdos_partition_mbr *mbr = (void *) buffer;
memset (mbr->entries, 0, sizeof(mbr->entries));
/* Some idiotic BIOSes refuse to boot if they don't find at least
one partition with active bit set. */
mbr->entries[0].flag = 0x80;
/* Doesn't really matter, as long as it's non-zero. It seems that
0xCD is used elsewhere, so we follow suit. */
mbr->entries[0].type = 0xcd;
/* Start immediately (sector 1). */
mbr->entries[0].start = 1;
/* We don't know yet. Let's keep it safe. */
mbr->entries[0].length = UINT32_MAX;
mbr->signature = MSDOS_PARTITION_SIGNATURE;
}
xfwrite (buffer, 1, 2048 * PADBLOCK_SIZE, outfile);
last_extent_written += PADBLOCK_SIZE;