uint32_t flags)
{
char cipher[MAX_CIPHER_LEN], dm_name[PATH_MAX], dm_dev_name[PATH_MAX];
- struct device *device = NULL;
+ char *part_path;
+ struct device *device = NULL, *part_device = NULL;
unsigned int i;
int r;
struct tcrypt_algs *algs;
else
device_check = DEV_EXCL;
+ if ((params->flags & CRYPT_TCRYPT_SYSTEM_HEADER) &&
+ (part_path = crypt_get_partition_device(device_path(dmd.data_device),
+ dmd.u.crypt.offset, dmd.size))) {
+ if (!device_alloc(&part_device, part_path)) {
+ log_verbose(cd, _("Activating TCRYPT system encryption for partition %s.\n"),
+ part_path);
+ dmd.data_device = part_device;
+ dmd.u.crypt.offset = 0;
+ }
+ free(part_path);
+ }
+
r = device_block_adjust(cd, dmd.data_device, device_check,
dmd.u.crypt.offset, &dmd.size, &dmd.flags);
if (r)
r = -ENOTSUP;
}
+ device_free(part_device);
crypt_free_volume_key(dmd.u.crypt.vk);
return r;
}
return devpath;
}
-static int _sysfs_get_uint64(int major, int minor, uint64_t *value, const char *attr)
+static int _read_uint64(const char *sysfs_path, uint64_t *value)
{
- char path[PATH_MAX], tmp[64] = {0};
+ char tmp[64] = {0};
int fd, r;
- if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/%s",
- major, minor, attr) < 0)
- return 0;
-
- if ((fd = open(path, O_RDONLY)) < 0)
+ if ((fd = open(sysfs_path, O_RDONLY)) < 0)
return 0;
r = read(fd, tmp, sizeof(tmp));
close(fd);
return 1;
}
+static int _sysfs_get_uint64(int major, int minor, uint64_t *value, const char *attr)
+{
+ char path[PATH_MAX];
+
+ if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d/%s",
+ major, minor, attr) < 0)
+ return 0;
+
+ return _read_uint64(path, value);
+}
+
+static int _path_get_uint64(const char *sysfs_path, uint64_t *value, const char *attr)
+{
+ char path[PATH_MAX];
+
+ if (snprintf(path, sizeof(path), "%s/%s",
+ sysfs_path, attr) < 0)
+ return 0;
+
+ return _read_uint64(path, value);
+}
+
int crypt_dev_is_rotational(int major, int minor)
{
uint64_t val;
return val ? 1 : 0;
}
+
+/* Try to find partition which match offset and size on top level device */
+char *crypt_get_partition_device(const char *dev_path, uint64_t offset, uint64_t size)
+{
+ char link[PATH_MAX], path[PATH_MAX], part_path[PATH_MAX], *devname;
+ char *result = NULL;
+ struct stat st;
+ size_t devname_len;
+ ssize_t len;
+ struct dirent *entry;
+ DIR *dir;
+ uint64_t part_offset, part_size;
+
+ if (stat(dev_path, &st) < 0)
+ return NULL;
+
+ if (!S_ISBLK(st.st_mode))
+ return NULL;
+
+ if (snprintf(path, sizeof(path), "/sys/dev/block/%d:%d",
+ major(st.st_rdev), minor(st.st_rdev)) < 0)
+ return NULL;
+
+ len = readlink(path, link, sizeof(link) - 1);
+ if (len < 0)
+ return NULL;
+
+ /* Get top level disk name for sysfs search */
+ link[len] = '\0';
+ devname = strrchr(link, '/');
+ if (!devname)
+ return NULL;
+ devname++;
+
+ /* DM devices do not use kernel partitions. */
+ if (dm_is_dm_kernel_name(devname))
+ return NULL;
+
+ dir = opendir(path);
+ if (!dir)
+ return NULL;
+
+ devname_len = strlen(devname);
+ while((entry = readdir(dir))) {
+ if (strncmp(entry->d_name, devname, devname_len))
+ continue;
+
+ if (snprintf(part_path, sizeof(part_path), "%s/%s",
+ path, entry->d_name) < 0)
+ continue;
+
+ if (stat(part_path, &st) < 0)
+ continue;
+
+ if (S_ISDIR(st.st_mode)) {
+ if (!_path_get_uint64(part_path, &part_offset, "start") ||
+ !_path_get_uint64(part_path, &part_size, "size"))
+ continue;
+ if (part_offset == offset && part_size == size &&
+ snprintf(part_path, sizeof(part_path), "/dev/%s",
+ entry->d_name) > 0) {
+ result = strdup(part_path);
+ break;
+ }
+ }
+ }
+ closedir(dir);
+
+ return result;
+}