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|
/* chainloader.c - boot another boot loader */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2004,2007,2009,2010 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/>.
*/
#include <grub/loader.h>
#include <grub/file.h>
#include <grub/err.h>
#include <grub/device.h>
#include <grub/disk.h>
#include <grub/misc.h>
#include <grub/types.h>
#include <grub/partition.h>
#include <grub/dl.h>
#include <grub/command.h>
#include <grub/machine/biosnum.h>
#include <grub/i18n.h>
#include <grub/video.h>
#include <grub/mm.h>
#include <grub/cpu/relocator.h>
#include <grub/deflate.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_dl_t my_mod;
static struct grub_relocator *rel;
static grub_uint32_t edx = 0xffffffff;
static grub_uint16_t sp;
static grub_uint32_t destaddr;
#define GRUB_TRUECRYPT_SEGMENT 0x2000
static grub_err_t
grub_truecrypt_boot (void)
{
grub_uint16_t segment = destaddr >> 4;
struct grub_relocator16_state state = {
.cs = segment,
.ds = segment,
.es = segment,
.fs = segment,
.gs = segment,
.ss = segment,
.ip = 0x100,
.sp = sp,
.edx = edx,
.a20 = 1
};
grub_video_set_mode ("text", 0, 0);
return grub_relocator16_boot (rel, state);
}
static grub_err_t
grub_truecrypt_unload (void)
{
grub_relocator_unload (rel);
rel = NULL;
grub_dl_unref (my_mod);
return GRUB_ERR_NONE;
}
/* Information on protocol supplied by Attila Lendvai. */
#define MAGIC "\0CD001\1EL TORITO SPECIFICATION"
static grub_err_t
grub_cmd_truecrypt (grub_command_t cmd __attribute__ ((unused)),
int argc, char *argv[])
{
grub_file_t file = 0;
grub_err_t err;
void *truecrypt;
grub_size_t truecryptsize;
const grub_size_t truecryptmemsize = 42 * 1024;
grub_uint8_t dh;
grub_uint32_t catalog, rba;
grub_uint8_t buf[128];
char *compressed = NULL;
char *uncompressed = NULL;
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
rel = NULL;
grub_dl_ref (my_mod);
file = grub_file_open (argv[0], GRUB_FILE_TYPE_TRUECRYPT);
if (! file)
goto fail;
if (grub_file_seek (file, 17 * 2048) == (grub_size_t) -1)
goto fail;
if (grub_file_read (file, buf, sizeof (buf))
!= sizeof (buf))
goto fail;
if (grub_memcmp (buf, MAGIC, sizeof (MAGIC)) != 0)
{
grub_error (GRUB_ERR_BAD_OS, "invalid eltorito signature");
goto fail;
}
catalog = grub_get_unaligned32 (buf + 0x47);
if (grub_file_seek (file, catalog * 2048) == (grub_size_t)-1)
goto fail;
if (grub_file_read (file, buf, sizeof (buf))
!= sizeof (buf))
goto fail;
if (buf[0] != 1 || buf[1] != 0 || buf[0x1e] != 0x55
|| buf[0x1f] != 0xaa || buf[0x20] != 0x88
|| buf[0x26] != 1 || buf[0x27] != 0)
{
grub_error (GRUB_ERR_BAD_OS, "invalid eltorito catalog");
goto fail;
}
rba = grub_get_unaligned32 (buf + 0x28);
if (grub_file_seek (file, rba * 2048 + 0x1b7) == (grub_size_t) -1)
goto fail;
if (grub_file_read (file, &dh, 1)
!= 1)
goto fail;
if (grub_file_seek (file, rba * 2048 + 512 + 2048) == (grub_size_t) -1)
goto fail;
compressed = grub_malloc (57 * 512);
if (!compressed)
goto fail;
if (grub_file_read (file, compressed, 57 * 512)
!= 57 * 512)
goto fail;
uncompressed = grub_malloc (truecryptmemsize);
if (!uncompressed)
goto fail;
/* It's actually gzip but our gzip decompressor isn't able to handle
trailing garbage, hence let's use raw decompressor. */
truecryptsize = grub_deflate_decompress (compressed + 10, 57 * 512 - 10,
0, uncompressed, truecryptmemsize);
if ((grub_ssize_t) truecryptsize < 0)
goto fail;
if (truecryptmemsize <= truecryptsize + 0x100)
{
grub_error (GRUB_ERR_BAD_OS, "file is too big");
goto fail;
}
rel = grub_relocator_new ();
if (!rel)
goto fail;
edx = (dh << 8) | grub_get_root_biosnumber ();
destaddr = ALIGN_DOWN (grub_min (0x90000, grub_mmap_get_lower ())
- truecryptmemsize, 64 * 1024);
{
grub_relocator_chunk_t ch;
err = grub_relocator_alloc_chunk_addr (rel, &ch, destaddr,
truecryptmemsize);
if (err)
goto fail;
truecrypt = get_virtual_current_address (ch);
}
grub_memset (truecrypt, 0, 0x100);
grub_memcpy ((char *) truecrypt + 0x100, uncompressed, truecryptsize);
grub_memset ((char *) truecrypt + truecryptsize + 0x100,
0, truecryptmemsize - truecryptsize - 0x100);
sp = truecryptmemsize - 4;
grub_loader_set (grub_truecrypt_boot, grub_truecrypt_unload, 1);
grub_free (uncompressed);
grub_free (compressed);
return GRUB_ERR_NONE;
fail:
if (!grub_errno)
grub_error (GRUB_ERR_BAD_OS, "bad truecrypt ISO");
if (file)
grub_file_close (file);
grub_truecrypt_unload ();
grub_free (uncompressed);
grub_free (compressed);
return grub_errno;
}
static grub_command_t cmd;
GRUB_MOD_INIT(truecrypt)
{
cmd = grub_register_command ("truecrypt", grub_cmd_truecrypt,
0, N_("Load Truecrypt ISO."));
my_mod = mod;
}
GRUB_MOD_FINI(truecrypt)
{
grub_unregister_command (cmd);
}
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