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Do not touch new LUKS headers.

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This commit is contained in:
Milan Broz
2012-06-17 12:44:53 +02:00
parent dc067454c1
commit 28c6901de1
1 changed files with 16 additions and 6 deletions
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18
src/cryptsetup_reencrypt.c
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@@ -35,6 +35,7 @@
#include <sys/ioctl.h>
#include <sys/time.h>
#include <linux/fs.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <signal.h>
#include <popt.h>
@@ -199,11 +200,13 @@ static int alignment(int fd)
return alignment;
}
/* Depends on the first two fields of LUKS1 header format, magic and version */
static int device_check(struct reenc_ctx *rc, header_magic set_magic)
{
char *buf = NULL;
int r, devfd;
ssize_t s;
uint16_t version;
devfd = open(rc->device, O_RDWR | O_EXCL | O_DIRECT);
if (devfd == -1) {
@@ -234,16 +237,21 @@ static int device_check(struct reenc_ctx *rc, header_magic set_magic)
return -EIO;
}
if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L)) {
/* Be sure that we do not process new version of header */
memcpy((void*)&version, &buf[MAGIC_L], sizeof(uint16_t));
version = ntohs(version);
if (set_magic == MAKE_UNUSABLE && !memcmp(buf, MAGIC, MAGIC_L) &&
version == 1) {
log_verbose(_("Marking LUKS device %s unusable.\n"), rc->device);
memcpy(buf, NOMAGIC, MAGIC_L);
r = 0;
} else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L)) {
} else if (set_magic == MAKE_USABLE && !memcmp(buf, NOMAGIC, MAGIC_L) &&
version == 1) {
log_verbose(_("Marking LUKS device %s usable.\n"), rc->device);
memcpy(buf, MAGIC, MAGIC_L);
r = 0;
} else if (set_magic == CHECK_UNUSABLE) {
} else if (set_magic == CHECK_UNUSABLE && version == 1) {
r = memcmp(buf, NOMAGIC, MAGIC_L) ? -EINVAL : 0;
if (!r)
rc->device_uuid = strndup(&buf[0xa8], 40);
@@ -551,7 +559,9 @@ static void remove_headers(struct reenc_ctx *rc)
if (crypt_init(&cd, NULL))
return;
crypt_set_log_callback(cd, _quiet_log, NULL);
if (*rc->header_file_org)
(void)crypt_deactivate(cd, rc->header_file_org);
if (*rc->header_file_new)
(void)crypt_deactivate(cd, rc->header_file_new);
crypt_free(cd);
}