005dd67cb6
* grub-core/fs/romfs.c: Likewise. * grub-core/lib/ia64/setjmp.S: Likewise. * grub-core/loader/i386/pc/freedos.c: Likewise. * grub-core/loader/ia64/efi/linux.c: Likewise. * grub-core/video/colors.c: Likewise. * include/grub/dl.h (GRUB_MOD_DEP): New macro.
460 lines
11 KiB
C
460 lines
11 KiB
C
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 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/file.h>
|
|
#include <grub/types.h>
|
|
#include <grub/dl.h>
|
|
#include <grub/mm.h>
|
|
#include <grub/disk.h>
|
|
#include <grub/fs.h>
|
|
#include <grub/fshelp.h>
|
|
|
|
GRUB_MOD_LICENSE ("GPLv3+");
|
|
|
|
struct grub_romfs_superblock
|
|
{
|
|
char magic[8];
|
|
#define GRUB_ROMFS_MAGIC "-rom1fs-"
|
|
grub_uint32_t total_size;
|
|
grub_uint32_t chksum;
|
|
char label[0];
|
|
};
|
|
|
|
struct grub_romfs_file_header
|
|
{
|
|
grub_uint32_t next_file;
|
|
grub_uint32_t spec;
|
|
grub_uint32_t size;
|
|
grub_uint32_t chksum;
|
|
char name[0];
|
|
};
|
|
|
|
struct grub_romfs_data
|
|
{
|
|
grub_disk_addr_t first_file;
|
|
grub_disk_t disk;
|
|
};
|
|
|
|
struct grub_fshelp_node
|
|
{
|
|
grub_disk_addr_t addr;
|
|
struct grub_romfs_data *data;
|
|
grub_disk_addr_t data_addr;
|
|
/* Not filled for root. */
|
|
struct grub_romfs_file_header file;
|
|
};
|
|
|
|
#define GRUB_ROMFS_ALIGN 16
|
|
#define GRUB_ROMFS_TYPE_MASK 7
|
|
#define GRUB_ROMFS_TYPE_HARDLINK 0
|
|
#define GRUB_ROMFS_TYPE_DIRECTORY 1
|
|
#define GRUB_ROMFS_TYPE_REGULAR 2
|
|
#define GRUB_ROMFS_TYPE_SYMLINK 3
|
|
|
|
static grub_err_t
|
|
do_checksum (void *in, grub_size_t insize)
|
|
{
|
|
grub_uint32_t *a = in;
|
|
grub_size_t sz = insize / 4;
|
|
grub_uint32_t *b = a + sz;
|
|
grub_uint32_t csum = 0;
|
|
|
|
while (a < b)
|
|
csum += grub_be_to_cpu32 (*a++);
|
|
if (csum)
|
|
return grub_error (GRUB_ERR_BAD_FS, "invalid checksum");
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static struct grub_romfs_data *
|
|
grub_romfs_mount (grub_device_t dev)
|
|
{
|
|
union {
|
|
struct grub_romfs_superblock sb;
|
|
char d[512];
|
|
} sb;
|
|
grub_err_t err;
|
|
char *ptr;
|
|
grub_disk_addr_t sec = 0;
|
|
struct grub_romfs_data *data;
|
|
if (!dev->disk)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_FS, "not a disk");
|
|
return NULL;
|
|
}
|
|
err = grub_disk_read (dev->disk, 0, 0, sizeof (sb), &sb);
|
|
if (err == GRUB_ERR_OUT_OF_RANGE)
|
|
err = grub_errno = GRUB_ERR_BAD_FS;
|
|
if (err)
|
|
return NULL;
|
|
if (grub_be_to_cpu32 (sb.sb.total_size) < sizeof (sb))
|
|
{
|
|
grub_error (GRUB_ERR_BAD_FS, "too short filesystem");
|
|
return NULL;
|
|
}
|
|
err = do_checksum (&sb, sizeof (sb) < grub_be_to_cpu32 (sb.sb.total_size) ?
|
|
sizeof (sb) : grub_be_to_cpu32 (sb.sb.total_size));
|
|
if (err)
|
|
return NULL;
|
|
for (ptr = sb.sb.label; (void *) ptr < (void *) (&sb + 1)
|
|
&& ptr < sb.d + grub_be_to_cpu32 (sb.sb.total_size); ptr++)
|
|
if (!*ptr)
|
|
break;
|
|
if ((void *) ptr == &sb + 1)
|
|
for (sec++; ; sec++)
|
|
{
|
|
err = grub_disk_read (dev->disk, sec, 0, sizeof (sb), &sb);
|
|
if (err == GRUB_ERR_OUT_OF_RANGE)
|
|
err = grub_errno = GRUB_ERR_BAD_FS;
|
|
if (err)
|
|
return NULL;
|
|
for (ptr = sb.d; (void *) ptr < (void *) (&sb + 1)
|
|
&& ptr < sb.d + grub_be_to_cpu32 (sb.sb.total_size); ptr++)
|
|
if (!*ptr)
|
|
break;
|
|
}
|
|
data = grub_malloc (sizeof (*data));
|
|
if (!data)
|
|
return NULL;
|
|
data->first_file = ALIGN_UP (ptr - sb.d, GRUB_ROMFS_ALIGN) + sec * 512;
|
|
data->disk = dev->disk;
|
|
return data;
|
|
}
|
|
|
|
static char *
|
|
grub_romfs_read_symlink (grub_fshelp_node_t node)
|
|
{
|
|
char *ret;
|
|
grub_err_t err;
|
|
ret = grub_malloc (grub_be_to_cpu32 (node->file.size) + 1);
|
|
if (!ret)
|
|
return NULL;
|
|
err = grub_disk_read (node->data->disk,
|
|
(node->data_addr) >> GRUB_DISK_SECTOR_BITS,
|
|
(node->data_addr) & (GRUB_DISK_SECTOR_SIZE - 1),
|
|
grub_be_to_cpu32 (node->file.size), ret);
|
|
if (err)
|
|
{
|
|
grub_free (ret);
|
|
return NULL;
|
|
}
|
|
ret[grub_be_to_cpu32 (node->file.size)] = 0;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
grub_romfs_iterate_dir (grub_fshelp_node_t dir,
|
|
int NESTED_FUNC_ATTR
|
|
(*hook) (const char *filename,
|
|
enum grub_fshelp_filetype filetype,
|
|
grub_fshelp_node_t node))
|
|
{
|
|
grub_disk_addr_t caddr;
|
|
struct grub_romfs_file_header hdr;
|
|
grub_size_t a = 0;
|
|
char *name = NULL;
|
|
unsigned nptr;
|
|
unsigned i, j;
|
|
for (caddr = dir->data_addr; caddr;
|
|
caddr = grub_be_to_cpu32 (hdr.next_file) & ~(GRUB_ROMFS_ALIGN - 1))
|
|
{
|
|
grub_disk_addr_t naddr = caddr + sizeof (hdr);
|
|
grub_uint32_t csum = 0;
|
|
enum grub_fshelp_filetype filetype = GRUB_FSHELP_UNKNOWN;
|
|
struct grub_fshelp_node *node;
|
|
grub_err_t err;
|
|
|
|
err = grub_disk_read (dir->data->disk, caddr >> GRUB_DISK_SECTOR_BITS,
|
|
caddr & (GRUB_DISK_SECTOR_SIZE - 1),
|
|
sizeof (hdr), &hdr);
|
|
if (err)
|
|
{
|
|
grub_free (name);
|
|
return 1;
|
|
}
|
|
for (nptr = 0; ; nptr++, naddr += 16)
|
|
{
|
|
if (a >= nptr)
|
|
{
|
|
char *on;
|
|
a = 2 * (nptr + 1);
|
|
on = name;
|
|
name = grub_realloc (name, a * 16);
|
|
if (!name)
|
|
{
|
|
grub_free (on);
|
|
return 1;
|
|
}
|
|
}
|
|
err = grub_disk_read (dir->data->disk, naddr >> GRUB_DISK_SECTOR_BITS,
|
|
naddr & (GRUB_DISK_SECTOR_SIZE - 1),
|
|
16, name + 16 * nptr);
|
|
if (err)
|
|
return 1;
|
|
for (j = 0; j < 16; j++)
|
|
if (!name[16 * nptr + j])
|
|
break;
|
|
if (j != 16)
|
|
break;
|
|
}
|
|
for (i = 0; i < sizeof (hdr) / sizeof (grub_uint32_t); i++)
|
|
csum += grub_be_to_cpu32 (((grub_uint32_t *) &hdr)[i]);
|
|
for (i = 0; i < (nptr + 1) * 4; i++)
|
|
csum += grub_be_to_cpu32 (((grub_uint32_t *) name)[i]);
|
|
if (csum != 0)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_FS, "invalid checksum");
|
|
grub_free (name);
|
|
return 1;
|
|
}
|
|
node = grub_malloc (sizeof (*node));
|
|
if (!node)
|
|
return 1;
|
|
node->addr = caddr;
|
|
node->data_addr = caddr + (nptr + 1) * 16 + sizeof (hdr);
|
|
node->data = dir->data;
|
|
node->file = hdr;
|
|
switch (grub_be_to_cpu32 (hdr.next_file) & GRUB_ROMFS_TYPE_MASK)
|
|
{
|
|
case GRUB_ROMFS_TYPE_REGULAR:
|
|
filetype = GRUB_FSHELP_REG;
|
|
break;
|
|
case GRUB_ROMFS_TYPE_SYMLINK:
|
|
filetype = GRUB_FSHELP_SYMLINK;
|
|
break;
|
|
case GRUB_ROMFS_TYPE_DIRECTORY:
|
|
node->data_addr = grub_be_to_cpu32 (hdr.spec);
|
|
filetype = GRUB_FSHELP_DIR;
|
|
break;
|
|
case GRUB_ROMFS_TYPE_HARDLINK:
|
|
{
|
|
grub_disk_addr_t laddr;
|
|
node->addr = laddr = grub_be_to_cpu32 (hdr.spec);
|
|
err = grub_disk_read (dir->data->disk,
|
|
laddr >> GRUB_DISK_SECTOR_BITS,
|
|
laddr & (GRUB_DISK_SECTOR_SIZE - 1),
|
|
sizeof (node->file), &node->file);
|
|
if (err)
|
|
return 1;
|
|
if ((grub_be_to_cpu32 (node->file.next_file) & GRUB_ROMFS_TYPE_MASK)
|
|
== GRUB_ROMFS_TYPE_REGULAR
|
|
|| (grub_be_to_cpu32 (node->file.next_file)
|
|
& GRUB_ROMFS_TYPE_MASK) == GRUB_ROMFS_TYPE_SYMLINK)
|
|
{
|
|
laddr += sizeof (hdr);
|
|
while (1)
|
|
{
|
|
char buf[16];
|
|
err = grub_disk_read (dir->data->disk,
|
|
laddr >> GRUB_DISK_SECTOR_BITS,
|
|
laddr & (GRUB_DISK_SECTOR_SIZE - 1),
|
|
16, buf);
|
|
if (err)
|
|
return 1;
|
|
for (i = 0; i < 16; i++)
|
|
if (!buf[i])
|
|
break;
|
|
if (i != 16)
|
|
break;
|
|
laddr += 16;
|
|
}
|
|
node->data_addr = laddr + 16;
|
|
}
|
|
if ((grub_be_to_cpu32 (node->file.next_file)
|
|
& GRUB_ROMFS_TYPE_MASK) == GRUB_ROMFS_TYPE_REGULAR)
|
|
filetype = GRUB_FSHELP_REG;
|
|
if ((grub_be_to_cpu32 (node->file.next_file)
|
|
& GRUB_ROMFS_TYPE_MASK) == GRUB_ROMFS_TYPE_SYMLINK)
|
|
filetype = GRUB_FSHELP_SYMLINK;
|
|
if ((grub_be_to_cpu32 (node->file.next_file) & GRUB_ROMFS_TYPE_MASK)
|
|
== GRUB_ROMFS_TYPE_DIRECTORY)
|
|
{
|
|
node->data_addr = grub_be_to_cpu32 (node->file.spec);
|
|
filetype = GRUB_FSHELP_DIR;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (hook (name, filetype, node))
|
|
{
|
|
grub_free (name);
|
|
return 1;
|
|
}
|
|
}
|
|
grub_free (name);
|
|
return 0;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_romfs_dir (grub_device_t device, const char *path,
|
|
int (*hook) (const char *filename,
|
|
const struct grub_dirhook_info *info))
|
|
{
|
|
struct grub_romfs_data *data = 0;
|
|
struct grub_fshelp_node *fdiro = 0, start;
|
|
|
|
auto int NESTED_FUNC_ATTR iterate (const char *filename,
|
|
enum grub_fshelp_filetype filetype,
|
|
grub_fshelp_node_t node);
|
|
|
|
int NESTED_FUNC_ATTR iterate (const char *filename,
|
|
enum grub_fshelp_filetype filetype,
|
|
grub_fshelp_node_t node)
|
|
{
|
|
struct grub_dirhook_info info;
|
|
grub_memset (&info, 0, sizeof (info));
|
|
|
|
info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
|
|
grub_free (node);
|
|
return hook (filename, &info);
|
|
}
|
|
|
|
data = grub_romfs_mount (device);
|
|
if (! data)
|
|
goto fail;
|
|
|
|
start.addr = data->first_file;
|
|
start.data_addr = data->first_file;
|
|
start.data = data;
|
|
grub_fshelp_find_file (path, &start, &fdiro, grub_romfs_iterate_dir,
|
|
grub_romfs_read_symlink, GRUB_FSHELP_DIR);
|
|
if (grub_errno)
|
|
goto fail;
|
|
|
|
grub_romfs_iterate_dir (fdiro, iterate);
|
|
|
|
fail:
|
|
grub_free (data);
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_romfs_open (struct grub_file *file, const char *name)
|
|
{
|
|
struct grub_romfs_data *data = 0;
|
|
struct grub_fshelp_node *fdiro = 0, start;
|
|
|
|
data = grub_romfs_mount (file->device);
|
|
if (! data)
|
|
goto fail;
|
|
|
|
start.addr = data->first_file;
|
|
start.data_addr = data->first_file;
|
|
start.data = data;
|
|
|
|
grub_fshelp_find_file (name, &start, &fdiro, grub_romfs_iterate_dir,
|
|
grub_romfs_read_symlink, GRUB_FSHELP_REG);
|
|
if (grub_errno)
|
|
goto fail;
|
|
|
|
file->size = grub_be_to_cpu32 (fdiro->file.size);
|
|
file->data = fdiro;
|
|
|
|
fail:
|
|
grub_free (data);
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
static grub_ssize_t
|
|
grub_romfs_read (grub_file_t file, char *buf, grub_size_t len)
|
|
{
|
|
struct grub_fshelp_node *data = file->data;
|
|
|
|
/* XXX: The file is stored in as a single extent. */
|
|
data->data->disk->read_hook = file->read_hook;
|
|
grub_disk_read (data->data->disk,
|
|
(data->data_addr + file->offset) >> GRUB_DISK_SECTOR_BITS,
|
|
(data->data_addr + file->offset) & (GRUB_DISK_SECTOR_SIZE - 1),
|
|
len, buf);
|
|
data->data->disk->read_hook = NULL;
|
|
|
|
if (grub_errno)
|
|
return -1;
|
|
|
|
return len;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_romfs_close (grub_file_t file)
|
|
{
|
|
grub_free (file->data);
|
|
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_romfs_label (grub_device_t device, char **label)
|
|
{
|
|
struct grub_romfs_data *data;
|
|
grub_err_t err;
|
|
|
|
*label = NULL;
|
|
|
|
data = grub_romfs_mount (device);
|
|
if (!data)
|
|
return grub_errno;
|
|
*label = grub_malloc (data->first_file + 1
|
|
- sizeof (struct grub_romfs_superblock));
|
|
if (!*label)
|
|
{
|
|
grub_free (data);
|
|
return grub_errno;
|
|
}
|
|
err = grub_disk_read (device->disk, 0, sizeof (struct grub_romfs_superblock),
|
|
data->first_file
|
|
- sizeof (struct grub_romfs_superblock),
|
|
*label);
|
|
if (err)
|
|
{
|
|
grub_free (data);
|
|
grub_free (*label);
|
|
*label = NULL;
|
|
return err;
|
|
}
|
|
(*label)[data->first_file - sizeof (struct grub_romfs_superblock)] = 0;
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
|
|
static struct grub_fs grub_romfs_fs =
|
|
{
|
|
.name = "romfs",
|
|
.dir = grub_romfs_dir,
|
|
.open = grub_romfs_open,
|
|
.read = grub_romfs_read,
|
|
.close = grub_romfs_close,
|
|
.label = grub_romfs_label,
|
|
#ifdef GRUB_UTIL
|
|
.reserved_first_sector = 0,
|
|
#endif
|
|
.next = 0
|
|
};
|
|
|
|
GRUB_MOD_INIT(romfs)
|
|
{
|
|
grub_fs_register (&grub_romfs_fs);
|
|
}
|
|
|
|
GRUB_MOD_FINI(romfs)
|
|
{
|
|
grub_fs_unregister (&grub_romfs_fs);
|
|
}
|