-#include <sys/types.h>
-#include <sys/stat.h>
#include <sys/ioctl.h>
-#include <unistd.h>
+#include <sys/stat.h>
+#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <libdevmapper.h>
-#include <linux/dm-ioctl.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <uuid/uuid.h>
#include "luks.h"
#define DEVICE_DIR "/dev"
+#define DM_UUID_LEN 129
#define DM_UUID_PREFIX "CRYPT-"
#define DM_UUID_PREFIX_LEN 6
#define DM_CRYPT_TARGET "crypt"
#define RETRY_COUNT 5
+/* Set if dm-crypt version was probed */
+static int _dm_crypt_checked = 0;
+static int _dm_crypt_wipe_key_supported = 0;
+
static int _dm_use_count = 0;
static struct crypt_device *_context = NULL;
+/* Compatibility for old device-mapper without udev support */
+#if HAVE_DECL_DM_UDEV_DISABLE_DISK_RULES_FLAG
+#define CRYPT_TEMP_UDEV_FLAGS DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG | \
+ DM_UDEV_DISABLE_DISK_RULES_FLAG | \
+ DM_UDEV_DISABLE_OTHER_RULES_FLAG
+#define _dm_task_set_cookie dm_task_set_cookie
+#define _dm_udev_wait dm_udev_wait
+#else
+#define CRYPT_TEMP_UDEV_FLAGS 0
+static int _dm_task_set_cookie(struct dm_task *dmt, uint32_t *cookie, uint16_t flags) { return 0; }
+static int _dm_udev_wait(uint32_t cookie) { return 0; };
+#endif
+
+static int _dm_use_udev()
+{
+#ifdef USE_UDEV /* cannot be enabled if devmapper is too old */
+ return dm_udev_get_sync_support();
+#else
+ return 0;
+#endif
+}
+
static void set_dm_error(int level, const char *file, int line,
const char *f, ...)
{
va_end(va);
}
-static int _dm_simple(int task, const char *name);
+static int _dm_simple(int task, const char *name, int udev_wait);
+
+static void _dm_set_crypt_compat(int maj, int min, int patch)
+{
+ log_dbg("Detected dm-crypt target of version %i.%i.%i.", maj, min, patch);
+
+ if (maj >= 1 && min >=2)
+ _dm_crypt_wipe_key_supported = 1;
+ else
+ log_dbg("Suspend and resume disabled, no wipe key support.");
+
+ _dm_crypt_checked = 1;
+}
+
+static int _dm_check_versions(void)
+{
+ struct dm_task *dmt;
+ struct dm_versions *target, *last_target;
+
+ if (_dm_crypt_checked)
+ return 1;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
+ return 0;
+
+ if (!dm_task_run(dmt)) {
+ dm_task_destroy(dmt);
+ return 0;
+ }
+
+ target = dm_task_get_versions(dmt);
+ do {
+ last_target = target;
+ if (!strcmp(DM_CRYPT_TARGET, target->name)) {
+ _dm_set_crypt_compat((int)target->version[0],
+ (int)target->version[1],
+ (int)target->version[2]);
+ }
+ target = (void *) target + target->next;
+ } while (last_target != target);
+
+ dm_task_destroy(dmt);
+ return 1;
+}
int dm_init(struct crypt_device *context, int check_kernel)
{
if (!_dm_use_count++) {
- log_dbg("Initialising device-mapper backend%s.",
- check_kernel ? "" : " (NO kernel check requested)");
- if (check_kernel && !_dm_simple(DM_DEVICE_LIST_VERSIONS, NULL)) {
+ log_dbg("Initialising device-mapper backend%s, UDEV is %sabled.",
+ check_kernel ? "" : " (NO kernel check requested)",
+ _dm_use_udev() ? "en" : "dis");
+ if (check_kernel && !_dm_check_versions()) {
log_err(context, _("Cannot initialize device-mapper. Is dm_mod kernel module loaded?\n"));
return -1;
}
continue;
strncpy(ptr, entry->d_name, space);
- if (lstat(path, &st) < 0)
+ if (stat(path, &st) < 0)
continue;
if (S_ISDIR(st.st_mode)) {
{
uint32_t major, minor;
dev_t dev;
- char *result, buf[PATH_MAX + 1];
+ char *result = NULL, buf[PATH_MAX + 1];
if (sscanf(dev_id, "%" PRIu32 ":%" PRIu32, &major, &minor) != 2)
return NULL;
strncpy(buf, DEVICE_DIR, PATH_MAX);
result = __lookup_dev(buf, dev, 0, 4);
- /* If not found, return major:minor */
- return result ?: strdup(dev_id);
+ /* If not found, return NULL */
+ return result;
}
static int _dev_read_ahead(const char *dev, uint32_t *read_ahead)
}
/* DM helpers */
-static int _dm_simple(int task, const char *name)
+static int _dm_simple(int task, const char *name, int udev_wait)
{
int r = 0;
struct dm_task *dmt;
+ uint32_t cookie = 0;
+
+ if (!_dm_use_udev())
+ udev_wait = 0;
if (!(dmt = dm_task_create(task)))
return 0;
if (name && !dm_task_set_name(dmt, name))
goto out;
+ if (udev_wait && !_dm_task_set_cookie(dmt, &cookie, 0))
+ goto out;
+
r = dm_task_run(dmt);
+ if (udev_wait)
+ (void)_dm_udev_wait(cookie);
+
out:
dm_task_destroy(dmt);
return r;
if (!dm_task_run(dmt))
goto error;
- if (!_dm_simple(DM_DEVICE_RESUME, name)) {
- _dm_simple(DM_DEVICE_CLEAR, name);
+ if (!_dm_simple(DM_DEVICE_RESUME, name, 1)) {
+ _dm_simple(DM_DEVICE_CLEAR, name, 0);
goto error;
}
return -EINVAL;
do {
- r = _dm_simple(DM_DEVICE_REMOVE, name) ? 0 : -EINVAL;
+ r = _dm_simple(DM_DEVICE_REMOVE, name, 1) ? 0 : -EINVAL;
if (--retries && r) {
log_dbg("WARNING: other process locked internal device %s, %s.",
name, retries ? "retrying remove" : "giving up");
int reload)
{
struct dm_task *dmt = NULL;
- struct dm_task *dmt_query = NULL;
struct dm_info dmi;
char *params = NULL;
char *error = NULL;
char dev_uuid[DM_UUID_LEN] = {0};
int r = -EINVAL;
uint32_t read_ahead = 0;
+ uint32_t cookie = 0;
+ uint16_t udev_flags = 0;
params = get_params(device, skip, offset, cipher, key_size, key);
if (!params)
goto out_no_removal;
+ if (type && !strncmp(type, "TEMP", 4))
+ udev_flags = CRYPT_TEMP_UDEV_FLAGS;
+
/* All devices must have DM_UUID, only resize on old device is exception */
if (reload) {
if (!(dmt = dm_task_create(DM_DEVICE_RELOAD)))
if (!dm_task_set_uuid(dmt, dev_uuid))
goto out_no_removal;
- }
+ if (_dm_use_udev() && !_dm_task_set_cookie(dmt, &cookie, udev_flags))
+ goto out_no_removal;
+ }
if (read_only && !dm_task_set_ro(dmt))
goto out_no_removal;
goto out;
if (uuid && !dm_task_set_uuid(dmt, dev_uuid))
goto out;
+ if (_dm_use_udev() && !_dm_task_set_cookie(dmt, &cookie, udev_flags))
+ goto out;
if (!dm_task_run(dmt))
goto out;
}
r = 0;
out:
+ if (_dm_use_udev()) {
+ (void)_dm_udev_wait(cookie);
+ cookie = 0;
+ }
+
if (r < 0 && !reload) {
if (get_error())
error = strdup(get_error());
}
out_no_removal:
+ if (cookie && _dm_use_udev())
+ (void)_dm_udev_wait(cookie);
+
if (params)
safe_free(params);
if (dmt)
dm_task_destroy(dmt);
- if(dmt_query)
- dm_task_destroy(dmt_query);
+
dm_task_update_nodes();
return r;
}
int dm_suspend_and_wipe_key(const char *name)
{
- if (!_dm_simple(DM_DEVICE_SUSPEND, name))
+ if (!_dm_check_versions())
+ return -ENOTSUP;
+
+ if (!_dm_crypt_wipe_key_supported)
+ return -ENOTSUP;
+
+ if (!_dm_simple(DM_DEVICE_SUSPEND, name, 0))
return -EINVAL;
if (!_dm_message(name, "key wipe")) {
- _dm_simple(DM_DEVICE_RESUME, name);
+ _dm_simple(DM_DEVICE_RESUME, name, 1);
return -EINVAL;
}
char *msg;
int r = 0;
+ if (!_dm_check_versions())
+ return -ENOTSUP;
+
+ if (!_dm_crypt_wipe_key_supported)
+ return -ENOTSUP;
+
msg = safe_alloc(msg_size);
if (!msg)
return -ENOMEM;
hex_key(&msg[8], key_size, key);
if (!_dm_message(name, msg) ||
- !_dm_simple(DM_DEVICE_RESUME, name))
+ !_dm_simple(DM_DEVICE_RESUME, name, 1))
r = -EINVAL;
safe_free(msg);
projects / platform / upstream / cryptsetup.git / blobdiff