int LUKS_write_phdr(struct luks_phdr *hdr,
struct crypt_device *ctx)
{
struct device *device = crypt_metadata_device(ctx);
ssize_t hdr_size = sizeof(struct luks_phdr);
int devfd = 0;
unsigned int i;
struct luks_phdr convHdr;
int r;
log_dbg(ctx, "Updating LUKS header of size %zu on device %s",
sizeof(struct luks_phdr), device_path(device));
r = LUKS_check_device_size(ctx, hdr, 1);
if (r)
return r;
devfd = device_open(ctx, device, O_RDWR);
if (devfd < 0) {
if (errno == EACCES)
log_err(ctx, _("Cannot write to device %s, permission denied."),
device_path(device));
else
log_err(ctx, _("Cannot open device %s."), device_path(device));
return -EINVAL;
}
memcpy(&convHdr, hdr, hdr_size);
memset(&convHdr._padding, 0, sizeof(convHdr._padding));
/* Convert every uint16/32_t item to network byte order */
convHdr.version = htons(hdr->version);
convHdr.payloadOffset = htonl(hdr->payloadOffset);
convHdr.keyBytes = htonl(hdr->keyBytes);
convHdr.mkDigestIterations = htonl(hdr->mkDigestIterations);
for(i = 0; i < LUKS_NUMKEYS; ++i) {
convHdr.keyblock[i].active = htonl(hdr->keyblock[i].active);
convHdr.keyblock[i].passwordIterations = htonl(hdr->keyblock[i].passwordIterations);
convHdr.keyblock[i].keyMaterialOffset = htonl(hdr->keyblock[i].keyMaterialOffset);
convHdr.keyblock[i].stripes = htonl(hdr->keyblock[i].stripes);
}
r = write_lseek_blockwise(devfd, device_block_size(ctx, device), device_alignment(device),
&convHdr, hdr_size, 0) < hdr_size ? -EIO : 0;
if (r)
log_err(ctx, _("Error during update of LUKS header on device %s."), device_path(device));
device_sync(ctx, device);
/* Re-read header from disk to be sure that in-memory and on-disk data are the same. */
if (!r) {
r = LUKS_read_phdr(hdr, 1, 0, ctx);
if (r)
log_err(ctx, _("Error re-reading LUKS header after update on device %s."),
device_path(device));
}
return r;
}
int main(int argc, char** argv) {
LOGI("\nvvvv vvvv vvvv");
int width = 128;
int height = 128;
int channels = 4;
auto input = Halide::Buffer<int>::make_interleaved(width, height, channels);
LOGI("Allocated memory for %dx%dx%d image", width, height, channels);
input.for_each_element([&](int i, int j, int k) {
input(i, j, k) = ((i + j) % 2) * 6;
});
LOGI("Input :\n");
print(input);
auto output = Halide::Buffer<int>::make_interleaved(width, height, channels);
two_kernels_filter(input, output);
LOGI("Filter is done.");
output.device_sync();
LOGI("Sync is done");
output.copy_to_host();
LOGI("Output :\n");
print(output);
int count_mismatches = 0;
output.for_each_element([&](int i, int j, int k) {
int32_t output_value = output(i, j, k);
int32_t input_value = input(i, j, k);
if (output_value != input_value) {
if (count_mismatches < 100) {
std::ostringstream str;
str << "output and input results differ at "
<< "(" << i << ", " << j << ", " << k << "):"
<< output_value << " != " << input_value
<< "\n";
LOGI("%s", str.str().c_str());
}
count_mismatches++;
}
});
LOGI(count_mismatches == 0 ? "Test passed.\n": "Test failed.\n");
halide_device_release(NULL, halide_openglcompute_device_interface());
LOGI("^^^^ ^^^^ ^^^^\n");
}
int LUKS_hdr_restore(
const char *backup_file,
struct luks_phdr *hdr,
struct crypt_device *ctx)
{
struct device *device = crypt_metadata_device(ctx);
int fd, r = 0, devfd = -1, diff_uuid = 0;
ssize_t ret, buffer_size = 0;
char *buffer = NULL, msg[200];
struct luks_phdr hdr_file;
r = LUKS_read_phdr_backup(backup_file, &hdr_file, 0, ctx);
if (r == -ENOENT)
return r;
if (!r)
buffer_size = LUKS_device_sectors(&hdr_file) << SECTOR_SHIFT;
if (r || buffer_size < LUKS_ALIGN_KEYSLOTS) {
log_err(ctx, _("Backup file doesn't contain valid LUKS header."));
r = -EINVAL;
goto out;
}
buffer = crypt_safe_alloc(buffer_size);
if (!buffer) {
r = -ENOMEM;
goto out;
}
fd = open(backup_file, O_RDONLY);
if (fd == -1) {
log_err(ctx, _("Cannot open header backup file %s."), backup_file);
r = -EINVAL;
goto out;
}
ret = read_buffer(fd, buffer, buffer_size);
close(fd);
if (ret < buffer_size) {
log_err(ctx, _("Cannot read header backup file %s."), backup_file);
r = -EIO;
goto out;
}
r = LUKS_read_phdr(hdr, 0, 0, ctx);
if (r == 0) {
log_dbg(ctx, "Device %s already contains LUKS header, checking UUID and offset.", device_path(device));
if(hdr->payloadOffset != hdr_file.payloadOffset ||
hdr->keyBytes != hdr_file.keyBytes) {
log_err(ctx, _("Data offset or key size differs on device and backup, restore failed."));
r = -EINVAL;
goto out;
}
if (memcmp(hdr->uuid, hdr_file.uuid, UUID_STRING_L))
diff_uuid = 1;
}
if (snprintf(msg, sizeof(msg), _("Device %s %s%s"), device_path(device),
r ? _("does not contain LUKS header. Replacing header can destroy data on that device.") :
_("already contains LUKS header. Replacing header will destroy existing keyslots."),
diff_uuid ? _("\nWARNING: real device header has different UUID than backup!") : "") < 0) {
r = -ENOMEM;
goto out;
}
if (!crypt_confirm(ctx, msg)) {
r = -EINVAL;
goto out;
}
log_dbg(ctx, "Storing backup of header (%zu bytes) and keyslot area (%zu bytes) to device %s.",
sizeof(*hdr), buffer_size - LUKS_ALIGN_KEYSLOTS, device_path(device));
devfd = device_open(ctx, device, O_RDWR);
if (devfd < 0) {
if (errno == EACCES)
log_err(ctx, _("Cannot write to device %s, permission denied."),
device_path(device));
else
log_err(ctx, _("Cannot open device %s."), device_path(device));
r = -EINVAL;
goto out;
}
if (write_lseek_blockwise(devfd, device_block_size(ctx, device), device_alignment(device),
buffer, buffer_size, 0) < buffer_size) {
r = -EIO;
goto out;
}
/* Be sure to reload new data */
r = LUKS_read_phdr(hdr, 1, 0, ctx);
out:
device_sync(ctx, device);
crypt_safe_free(buffer);
return r;
}
