}
}
- gzio->saved_offset += WSIZE;
+ gzio->saved_offset += gzio->wp;
/* XXX do CRC calculation here! */
}
register char *srcaddr;
while (offset >= gzio->saved_offset)
- inflate_window (gzio);
+ {
+ inflate_window (gzio);
+ if (gzio->wp == 0)
+ goto out;
+ }
+
+ if (gzio->wp == 0)
+ goto out;
srcaddr = (char *) ((offset & (WSIZE - 1)) + gzio->slide);
size = gzio->saved_offset - offset;
offset += size;
}
+ out:
if (grub_errno != GRUB_ERR_NONE)
ret = -1;
static grub_ssize_t
grub_gzio_read (grub_file_t file, char *buf, grub_size_t len)
{
- return grub_gzio_read_real (file->data, file->offset, buf, len);
+ grub_ssize_t ret;
+ ret = grub_gzio_read_real (file->data, file->offset, buf, len);
+
+ if (!grub_errno && ret != (grub_ssize_t) len)
+ {
+ grub_error (GRUB_ERR_BAD_COMPRESSED_DATA, "premature end of compressed");
+ ret = -1;
+ }
+ return ret;
}
/* Release everything, including the underlying file object. */
ret = grub_gzio_read_real (gzio, off, outbuf, outsize);
grub_free (gzio);
+ if (!grub_errno && ret != (grub_ssize_t) outsize)
+ {
+ grub_error (GRUB_ERR_BAD_COMPRESSED_DATA, "premature end of compressed");
+ ret = -1;
+ }
+
/* FIXME: Check Adler. */
return ret;
}
+grub_ssize_t
+grub_deflate_decompress (char *inbuf, grub_size_t insize, grub_off_t off,
+ char *outbuf, grub_size_t outsize)
+{
+ grub_gzio_t gzio = 0;
+ grub_ssize_t ret;
+
+ gzio = grub_zalloc (sizeof (*gzio));
+ if (! gzio)
+ return -1;
+ gzio->mem_input = (grub_uint8_t *) inbuf;
+ gzio->mem_input_size = insize;
+ gzio->mem_input_off = 0;
+
+ initialize_tables (gzio);
+
+ ret = grub_gzio_read_real (gzio, off, outbuf, outsize);
+ grub_free (gzio);
+
+ return ret;
+}
+
\f
static struct grub_fs grub_gzio_fs =
--- /dev/null
+/* 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]);
+ 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)
+ return 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);
+}
projects / thirdparty / grub.git / commitdiff
