static int find_partition(BlockBackend *blk, int partition,
off_t *offset, off_t *size)
{
struct partition_record mbr[4];
uint8_t data[MBR_SIZE];
int i;
int ext_partnum = 4;
int ret;
ret = blk_pread(blk, 0, data, sizeof(data));
if (ret < 0) {
error_report("error while reading: %s", strerror(-ret));
exit(EXIT_FAILURE);
}
if (data[510] != 0x55 || data[511] != 0xaa) {
return -EINVAL;
}
for (i = 0; i < 4; i++) {
read_partition(&data[446 + 16 * i], &mbr[i]);
if (!mbr[i].system || !mbr[i].nb_sectors_abs) {
continue;
}
if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
struct partition_record ext[4];
uint8_t data1[MBR_SIZE];
int j;
ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
data1, sizeof(data1));
if (ret < 0) {
error_report("error while reading: %s", strerror(-ret));
exit(EXIT_FAILURE);
}
for (j = 0; j < 4; j++) {
read_partition(&data1[446 + 16 * j], &ext[j]);
if (!ext[j].system || !ext[j].nb_sectors_abs) {
continue;
}
if ((ext_partnum + j + 1) == partition) {
*offset = (uint64_t)ext[j].start_sector_abs << 9;
*size = (uint64_t)ext[j].nb_sectors_abs << 9;
return 0;
}
}
ext_partnum += 4;
} else if ((i + 1) == partition) {
*offset = (uint64_t)mbr[i].start_sector_abs << 9;
*size = (uint64_t)mbr[i].nb_sectors_abs << 9;
return 0;
}
}
return -ENOENT;
}
static int find_partition(BlockDriverState *bs, int partition,
off_t *offset, off_t *size)
{
struct partition_record mbr[4];
uint8_t data[512];
int i;
int ext_partnum = 4;
int ret;
if ((ret = bdrv_read(bs, 0, data, 1)) < 0) {
errno = -ret;
err(EXIT_FAILURE, "error while reading");
}
if (data[510] != 0x55 || data[511] != 0xaa) {
errno = -EINVAL;
return -1;
}
for (i = 0; i < 4; i++) {
read_partition(&data[446 + 16 * i], &mbr[i]);
if (!mbr[i].nb_sectors_abs)
continue;
if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
struct partition_record ext[4];
uint8_t data1[512];
int j;
if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) {
errno = -ret;
err(EXIT_FAILURE, "error while reading");
}
for (j = 0; j < 4; j++) {
read_partition(&data1[446 + 16 * j], &ext[j]);
if (!ext[j].nb_sectors_abs)
continue;
if ((ext_partnum + j + 1) == partition) {
*offset = (uint64_t)ext[j].start_sector_abs << 9;
*size = (uint64_t)ext[j].nb_sectors_abs << 9;
return 0;
}
}
ext_partnum += 4;
} else if ((i + 1) == partition) {
*offset = (uint64_t)mbr[i].start_sector_abs << 9;
*size = (uint64_t)mbr[i].nb_sectors_abs << 9;
return 0;
}
}
errno = -ENOENT;
return -1;
}
int main()
{
int s[MAXN+1]; /* dot thicknesses to partition */
int n; /* how many dots? */
int k; /* how many partitions? */
read_partition(s,&n,&k);
partition(s,n,k);
}
/*
* Read MSC command
*/
void msc_cmd_read()
{
struct msc_command my_cmd;
int msc_pt_handle;
uint32_t processed_bytes;
msc_pt_handle = 0;
if (open_partition("MSC", PARTITION_OPEN_READ, &msc_pt_handle))
goto finish;
if (read_partition(msc_pt_handle, &my_cmd, sizeof(my_cmd), &processed_bytes))
goto finish;
if (processed_bytes != sizeof(my_cmd))
goto finish;
memcpy(&msc_cmd, &my_cmd, sizeof(my_cmd));
finish:
close_partition(msc_pt_handle);
return;
}
// prepares the verity enabled (MF_VERIFY / MF_VERIFYATBOOT) fstab record for
// mount. The 'wait_for_verity_dev' parameter makes this function wait for the
// verity device to get created before return
int fs_mgr_setup_verity(FstabEntry* entry, bool wait_for_verity_dev) {
int retval = FS_MGR_SETUP_VERITY_FAIL;
int fd = -1;
std::string verity_blk_name;
struct fec_handle *f = NULL;
struct fec_verity_metadata verity;
struct verity_table_params params = { .table = NULL };
const std::string mount_point(basename(entry->mount_point.c_str()));
bool verified_at_boot = false;
android::dm::DeviceMapper& dm = android::dm::DeviceMapper::Instance();
if (fec_open(&f, entry->blk_device.c_str(), O_RDONLY, FEC_VERITY_DISABLE, FEC_DEFAULT_ROOTS) <
0) {
PERROR << "Failed to open '" << entry->blk_device << "'";
return retval;
}
// read verity metadata
if (fec_verity_get_metadata(f, &verity) < 0) {
PERROR << "Failed to get verity metadata '" << entry->blk_device << "'";
// Allow verity disabled when the device is unlocked without metadata
if (fs_mgr_is_device_unlocked()) {
retval = FS_MGR_SETUP_VERITY_SKIPPED;
LWARNING << "Allow invalid metadata when the device is unlocked";
}
goto out;
}
#ifdef ALLOW_ADBD_DISABLE_VERITY
if (verity.disabled) {
retval = FS_MGR_SETUP_VERITY_DISABLED;
LINFO << "Attempt to cleanly disable verity - only works in USERDEBUG/ENG";
goto out;
}
#endif
// read ecc metadata
if (fec_ecc_get_metadata(f, ¶ms.ecc) < 0) {
params.ecc.valid = false;
}
params.ecc_dev = entry->blk_device.c_str();
if (load_verity_state(*entry, ¶ms.mode) < 0) {
/* if accessing or updating the state failed, switch to the default
* safe mode. This makes sure the device won't end up in an endless
* restart loop, and no corrupted data will be exposed to userspace
* without a warning. */
params.mode = VERITY_MODE_EIO;
}
if (!verity.table) {
goto out;
}
params.table = strdup(verity.table);
if (!params.table) {
goto out;
}
// verify the signature on the table
if (verify_verity_signature(verity) < 0) {
// Allow signature verification error when the device is unlocked
if (fs_mgr_is_device_unlocked()) {
retval = FS_MGR_SETUP_VERITY_SKIPPED;
LWARNING << "Allow signature verification error when the device is unlocked";
goto out;
}
if (params.mode == VERITY_MODE_LOGGING) {
// the user has been warned, allow mounting without dm-verity
retval = FS_MGR_SETUP_VERITY_SKIPPED;
goto out;
}
// invalidate root hash and salt to trigger device-specific recovery
if (invalidate_table(params.table, verity.table_length) < 0) {
goto out;
}
}
LINFO << "Enabling dm-verity for " << mount_point.c_str()
<< " (mode " << params.mode << ")";
// Update the verity params using the actual block device path
update_verity_table_blk_device(entry->blk_device, ¶ms.table,
entry->fs_mgr_flags.slot_select);
// load the verity mapping table
if (load_verity_table(dm, mount_point, verity.data_size, ¶ms, format_verity_table) == 0) {
goto loaded;
}
if (params.ecc.valid) {
// kernel may not support error correction, try without
LINFO << "Disabling error correction for " << mount_point.c_str();
params.ecc.valid = false;
if (load_verity_table(dm, mount_point, verity.data_size, ¶ms, format_verity_table) == 0) {
goto loaded;
}
}
// try the legacy format for backwards compatibility
if (load_verity_table(dm, mount_point, verity.data_size, ¶ms, format_legacy_verity_table) ==
0) {
goto loaded;
}
if (params.mode != VERITY_MODE_EIO) {
// as a last resort, EIO mode should always be supported
LINFO << "Falling back to EIO mode for " << mount_point.c_str();
params.mode = VERITY_MODE_EIO;
if (load_verity_table(dm, mount_point, verity.data_size, ¶ms,
format_legacy_verity_table) == 0) {
goto loaded;
}
}
LERROR << "Failed to load verity table for " << mount_point.c_str();
goto out;
loaded:
if (!dm.GetDmDevicePathByName(mount_point, &verity_blk_name)) {
LERROR << "Couldn't get verity device number!";
goto out;
}
// mark the underlying block device as read-only
fs_mgr_set_blk_ro(entry->blk_device);
// Verify the entire partition in one go
// If there is an error, allow it to mount as a normal verity partition.
if (entry->fs_mgr_flags.verify_at_boot) {
LINFO << "Verifying partition " << entry->blk_device << " at boot";
int err = read_partition(verity_blk_name.c_str(), verity.data_size);
if (!err) {
LINFO << "Verified verity partition " << entry->blk_device << " at boot";
verified_at_boot = true;
}
}
// assign the new verity block device as the block device
if (!verified_at_boot) {
entry->blk_device = verity_blk_name;
} else if (!dm.DeleteDevice(mount_point)) {
LERROR << "Failed to remove verity device " << mount_point.c_str();
goto out;
}
// make sure we've set everything up properly
if (wait_for_verity_dev && !fs_mgr_wait_for_file(entry->blk_device, 1s)) {
goto out;
}
retval = FS_MGR_SETUP_VERITY_SUCCESS;
out:
if (fd != -1) {
close(fd);
}
fec_close(f);
free(params.table);
return retval;
}
// ---------------------------------------------------------------------------
//
// Read Master Boot Record (partitions)
//
static Cyg_ErrNo
read_mbr(disk_channel *chan)
{
cyg_disk_info_t *info = chan->info;
disk_funs *funs = chan->funs;
disk_controller *ctlr = chan->controller;
cyg_uint8 *buf = (cyg_uint8*)malloc(info->block_size);
Cyg_ErrNo res = ENOERR;
int i;
D(("read MBR\n"));
for (i = 0; i < info->partitions_num; i++)
info->partitions[i].type = 0x00;
cyg_drv_mutex_lock( &ctlr->lock );
while( ctlr->busy )
cyg_drv_cond_wait( &ctlr->queue );
ctlr->busy = true;
ctlr->result = -EWOULDBLOCK;
for( i = 0; i < sizeof(buf); i++ )
buf[i] = 0;
//diag_printf("buf = %p\n",buf);
res = (funs->read)(chan, (void *)buf, 1, 0);
if( res == -EWOULDBLOCK )
{
// If the driver replys EWOULDBLOCK, then the transfer is
// being handled asynchronously and when it is finished it
// will call disk_transfer_done(). This will wake us up here
// to continue.
while( ctlr->result == -EWOULDBLOCK )
cyg_drv_cond_wait( &ctlr->async );
res = ctlr->result;
}
ctlr->busy = false;
cyg_drv_mutex_unlock( &ctlr->lock );
if (ENOERR != res)
return res;
#ifdef DEBUG
diag_dump_buf_with_offset( buf, 512, buf );
#endif
//for test
//buf[MBR_SIG_ADDR+0]=0x55;buf[MBR_SIG_ADDR+1]=0xAA;
if (MBR_SIG_BYTE0 == buf[MBR_SIG_ADDR+0] && MBR_SIG_BYTE1 == buf[MBR_SIG_ADDR+1])
{
int npart;
D(("disk MBR found\n"));
npart = info->partitions_num < MBR_PART_NUM ?
info->partitions_num : MBR_PART_NUM;
for (i = 0; i < MBR_PART_NUM; i++)
{
cyg_disk_partition_t *part = &info->partitions[i];
part->index = i+1;
read_partition(&buf[MBR_PART_ADDR+MBR_PART_SIZE*i], info, part);
//read_partition(&buftest[MBR_PART_SIZE*i], info, part);
#ifdef DEBUG
if (0x00 != part->type)
{
D(("\ndisk MBR partition %d:\n", i));
D((" type = %02X\n", part->type));
D((" state = %02X\n", part->state));
D((" start = %d\n", part->start));
D((" end = %d\n", part->end));
D((" size = %d\n\n", part->size));
}
#endif
#if EBR
if(part->type == 0x05 || part->type == 0x0F)
read_ebr(chan,part);
#endif
}
}
free(buf);
return ENOERR;
}
static Cyg_ErrNo
read_ebr(disk_channel *chan,cyg_disk_partition_t *part)
{
cyg_disk_info_t *info = chan->info;
disk_funs *funs = chan->funs;
disk_controller *ctlr = chan->controller;
cyg_uint8 *buf = (cyg_uint8*)malloc(info->block_size);
Cyg_ErrNo res = ENOERR;
cyg_uint32 start=0;
int i,index = 5;
cyg_disk_partition_t *oldpart,*newpart=part;
D(("read EBR\n"));
while(1)
{
cyg_drv_mutex_lock( &ctlr->lock );
while( ctlr->busy )
cyg_drv_cond_wait( &ctlr->queue );
ctlr->busy = true;
ctlr->result = -EWOULDBLOCK;
res = (funs->read)(chan, (void *)buf, 1, newpart->start);
if( res == -EWOULDBLOCK )
{
// If the driver replys EWOULDBLOCK, then the transfer is
// being handled asynchronously and when it is finished it
// will call disk_transfer_done(). This will wake us up here
// to continue.
while( ctlr->result == -EWOULDBLOCK )
cyg_drv_cond_wait( &ctlr->async );
res = ctlr->result;
}
ctlr->busy = false;
cyg_drv_mutex_unlock( &ctlr->lock );
if (ENOERR != res)
return res;
#ifdef DEBUG
diag_dump_buf_with_offset( buf, 512, buf );
#endif
if (MBR_SIG_BYTE0 == buf[MBR_SIG_ADDR+0] && MBR_SIG_BYTE1 == buf[MBR_SIG_ADDR+1])
{
D(("disk EBR found\n"));
start = newpart->start;
read_partition(&buf[MBR_PART_ADDR+MBR_PART_SIZE*0], info, newpart);
//read_partition(&buftest[MBR_PART_SIZE*0], info, newpart);
newpart->start += start;
newpart->end += start;
#ifdef DEBUG
if (0x00 != part->type)
{
// D(("\ndisk MBR partition %d:\n", i));
D((" type = %02X\n", newpart->type));
D((" state = %02X\n", newpart->state));
D((" start = %d\n", newpart->start));
D((" end = %d\n", newpart->end));
D((" size = %d\n\n", newpart->size));
}
#endif
if(0x00 != buf[MBR_PART_ADDR+MBR_PART_SIZE+4])
//if(0x00 != buftest[MBR_PART_SIZE*1+4])
{
oldpart = newpart;
newpart = (cyg_disk_partition_t *)malloc(sizeof(struct cyg_disk_partition_t));
memset(newpart,0,sizeof(struct cyg_disk_partition_t));
oldpart->pnext = newpart;
newpart->index = index;
index++;
info->partitions_num++;
newpart->pnext = NULL;
read_partition(&buf[MBR_PART_ADDR+MBR_PART_SIZE], info, newpart);
newpart->start += start;
newpart->end += start;
}
else
break;
}
else break;
}
free(buf);
return res;
}