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Add cheatmounting

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-04-22 19:20:46 +02:00
parent dcd73ec05e
commit 24089d19e2
4 changed files with 166 additions and 40 deletions
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97
grub-core/disk/luks.c
View file

@ -25,6 +25,15 @@
#include <grub/crypto.h>
#include <grub/extcmd.h>
#include <grub/i18n.h>
#ifdef GRUB_UTIL
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <grub/emu/hostdisk.h>
#include <unistd.h>
#include <string.h>
#endif
GRUB_MOD_LICENSE ("GPLv3+");
@ -80,6 +89,10 @@ struct grub_luks
unsigned long id, source_id;
enum grub_disk_dev_id source_dev_id;
char uuid[sizeof (((struct grub_luks_phdr *) 0)->uuid) + 1];
#ifdef GRUB_UTIL
char *cheat;
int cheat_fd;
#endif
struct grub_luks *next;
};
typedef struct grub_luks *grub_luks_t;
@ -497,6 +510,12 @@ grub_luks_scan_device_real (const char *name, grub_disk_t source)
}
newdev->source = grub_strdup (name);
if (!newdev->source)
{
grub_free (newdev);
return grub_errno;
}
newdev->source_id = source->id;
newdev->source_dev_id = source->dev->id;
newdev->next = luks_list;
@ -507,6 +526,48 @@ grub_luks_scan_device_real (const char *name, grub_disk_t source)
return GRUB_ERR_NONE;
}
#ifdef GRUB_UTIL
grub_err_t
grub_luks_cheat_mount (const char *sourcedev, const char *cheat)
{
grub_err_t err;
struct grub_luks_phdr header;
grub_luks_t newdev;
grub_disk_t source;
/* Try to open disk. */
source = grub_disk_open (sourcedev);
if (!source)
return grub_errno;
/* Read the LUKS header. */
err = grub_disk_read (source, 0, 0, sizeof (header), &header);
if (err)
return err;
newdev = configure_ciphers (&header);
grub_disk_close (source);
if (!newdev)
return grub_errno;
newdev->cheat = grub_strdup (cheat);
newdev->source = grub_strdup (sourcedev);
if (!newdev->source || !newdev->cheat)
{
grub_free (newdev->source);
grub_free (newdev->cheat);
grub_free (newdev);
return grub_errno;
}
newdev->cheat_fd = -1;
newdev->source_id = source->id;
newdev->source_dev_id = source->dev->id;
newdev->next = luks_list;
luks_list = newdev;
return GRUB_ERR_NONE;
}
#endif
static int
grub_luks_scan_device (const char *name)
{
@ -575,6 +636,17 @@ grub_luks_open (const char *name, grub_disk_t disk,
if (!dev)
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "No such device");
#ifdef GRUB_UTIL
if (dev->cheat)
{
if (dev->cheat_fd == -1)
dev->cheat_fd = open (dev->cheat, O_RDONLY);
if (dev->cheat_fd == -1)
return grub_error (GRUB_ERR_IO, "couldn't open %s: %s",
dev->cheat, strerror (errno));
}
#endif
if (!dev->source_disk)
{
grub_dprintf ("luks", "Opening device %s\n", name);
@ -599,12 +671,18 @@ grub_luks_close (grub_disk_t disk)
dev->ref--;
if (dev->ref == 0)
if (dev->ref != 0)
return;
#ifdef GRUB_UTIL
if (dev->cheat)
{
close (dev->cheat_fd);
dev->cheat_fd = -1;
}
#endif
grub_disk_close (dev->source_disk);
dev->source_disk = NULL;
}
}
static grub_err_t
grub_luks_read (grub_disk_t disk, grub_disk_addr_t sector,
@ -612,6 +690,21 @@ grub_luks_read (grub_disk_t disk, grub_disk_addr_t sector,
{
grub_luks_t dev = (grub_luks_t) disk->data;
grub_err_t err;
#ifdef GRUB_UTIL
if (dev->cheat)
{
err = grub_util_fd_sector_seek (dev->cheat_fd, dev->cheat, sector);
if (err)
return err;
if (grub_util_fd_read (dev->cheat_fd, buf, size << GRUB_DISK_SECTOR_BITS)
!= (ssize_t) (size << GRUB_DISK_SECTOR_BITS))
return grub_error (GRUB_ERR_READ_ERROR, "cannot read from `%s'",
dev->cheat);
return GRUB_ERR_NONE;
}
#endif
grub_dprintf ("luks",
"Reading %" PRIuGRUB_SIZE " sectors from sector 0x%"
PRIxGRUB_UINT64_T " with offset of %" PRIuGRUB_UINT32_T "\n",

22
grub-core/kern/emu/getroot.c
View file

@ -865,7 +865,9 @@ out:
void
grub_util_pull_device (const char *os_dev)
{
switch (grub_util_get_dev_abstraction (os_dev))
int ab;
ab = grub_util_get_dev_abstraction (os_dev);
switch (ab)
{
case GRUB_DEV_ABSTRACTION_LVM:
case GRUB_DEV_ABSTRACTION_LUKS:
@ -875,6 +877,7 @@ grub_util_pull_device (const char *os_dev)
struct dm_tree_node *node;
struct dm_tree_node *child;
void *handle = NULL;
char *lastsubdev = NULL;
if (!grub_util_open_dm (os_dev, &tree, &node))
return;
@ -887,8 +890,25 @@ grub_util_pull_device (const char *os_dev)
continue;
subdev = grub_find_device ("/dev", makedev (dm->major, dm->minor));
if (subdev)
{
lastsubdev = subdev;
grub_util_pull_device (subdev);
}
}
if (ab == GRUB_DEV_ABSTRACTION_LUKS && lastsubdev)
{
char *grdev = grub_util_get_grub_dev (lastsubdev);
dm_tree_free (tree);
if (grdev)
{
grub_err_t err;
err = grub_luks_cheat_mount (grdev, os_dev);
if (err)
grub_util_error ("Can't mount LUKS: %s", grub_errmsg);
}
grub_free (grdev);
}
else
dm_tree_free (tree);
}
#endif

67
grub-core/kern/emu/hostdisk.c
View file

@ -631,6 +631,37 @@ linux_find_partition (char *dev, unsigned long sector)
}
#endif /* __linux__ */
#if defined(__linux__) && (!defined(__GLIBC__) || \
((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1))))
/* Maybe libc doesn't have large file support. */
grub_err_t
grub_util_fd_sector_seek (int fd, const char *name, grub_disk_addr_t sector)
{
loff_t offset, result;
static int _llseek (uint filedes, ulong hi, ulong lo,
loff_t *res, uint wh);
_syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
offset = (loff_t) sector << GRUB_DISK_SECTOR_BITS;
if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET))
{
return grub_error (GRUB_ERR_BAD_DEVICE, "cannot seek `%s'", name);
}
return GRUB_ERR_NONE;
}
#else
grub_err_t
grub_util_fd_sector_seek (int fd, const char *name, grub_disk_addr_t sector)
{
off_t offset = (off_t) sector << GRUB_DISK_SECTOR_BITS;
if (lseek (fd, offset, SEEK_SET) != offset)
return grub_error (GRUB_ERR_BAD_DEVICE, "cannot seek `%s'", name);
return 0;
}
#endif
static int
open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
{
@ -781,44 +812,19 @@ open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
configure_device_driver (fd);
#endif /* defined(__NetBSD__) */
#if defined(__linux__) && (!defined(__GLIBC__) || \
((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1))))
/* Maybe libc doesn't have large file support. */
if (grub_util_fd_sector_seek (fd, map[disk->id].device, sector))
{
loff_t offset, result;
static int _llseek (uint filedes, ulong hi, ulong lo,
loff_t *res, uint wh);
_syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
offset = (loff_t) sector << GRUB_DISK_SECTOR_BITS;
if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET))
{
grub_error (GRUB_ERR_BAD_DEVICE, "cannot seek `%s'", map[disk->id].device);
close (fd);
return -1;
}
}
#else
{
off_t offset = (off_t) sector << GRUB_DISK_SECTOR_BITS;
if (lseek (fd, offset, SEEK_SET) != offset)
{
grub_error (GRUB_ERR_BAD_DEVICE, "cannot seek `%s'", map[disk->id].device);
close (fd);
return -1;
}
}
#endif
return fd;
}
/* Read LEN bytes from FD in BUF. Return less than or equal to zero if an
error occurs, otherwise return LEN. */
static ssize_t
nread (int fd, char *buf, size_t len)
ssize_t
grub_util_fd_read (int fd, char *buf, size_t len)
{
ssize_t size = len;
@ -901,7 +907,8 @@ grub_util_biosdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
sectors that are read together with the MBR in one read. It
should only remap the MBR, so we split the read in two
parts. -jochen */
if (nread (fd, buf, GRUB_DISK_SECTOR_SIZE) != GRUB_DISK_SECTOR_SIZE)
if (grub_util_fd_read (fd, buf, GRUB_DISK_SECTOR_SIZE)
!= GRUB_DISK_SECTOR_SIZE)
{
grub_error (GRUB_ERR_READ_ERROR, "cannot read `%s'", map[disk->id].device);
return grub_errno;
@ -912,7 +919,7 @@ grub_util_biosdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
}
#endif /* __linux__ */
if (nread (fd, buf, size << GRUB_DISK_SECTOR_BITS)
if (grub_util_fd_read (fd, buf, size << GRUB_DISK_SECTOR_BITS)
!= (ssize_t) (size << GRUB_DISK_SECTOR_BITS))
grub_error (GRUB_ERR_READ_ERROR, "cannot read from `%s'", map[disk->id].device);

6
include/grub/emu/hostdisk.h
View file

@ -21,6 +21,7 @@
#define GRUB_BIOSDISK_MACHINE_UTIL_HEADER 1
#include <grub/disk.h>
#include <sys/types.h>
void grub_util_biosdisk_init (const char *dev_map);
void grub_util_biosdisk_fini (void);
@ -30,5 +31,10 @@ int grub_util_biosdisk_is_present (const char *name);
int grub_util_biosdisk_is_floppy (grub_disk_t disk);
grub_err_t grub_util_biosdisk_flush (struct grub_disk *disk);
void grub_util_pull_device (const char *osname);
grub_err_t
grub_util_fd_sector_seek (int fd, const char *name, grub_disk_addr_t sector);
ssize_t grub_util_fd_read (int fd, char *buf, size_t len);
grub_err_t
grub_luks_cheat_mount (const char *sourcedev, const char *cheat);
#endif /* ! GRUB_BIOSDISK_MACHINE_UTIL_HEADER */