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Check UUID of active device to match header when initializing context.

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git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@597 36d66b0a-2a48-0410-832c-cd162a569da5
This commit is contained in:
Milan Broz
2011-08-15 16:32:44 +00:00
parent 1f776bc979
commit 1f9efdf59a
1 changed files with 40 additions and 0 deletions
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40
lib/setup.c
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@@ -219,6 +219,36 @@ static int keyslot_verify_or_find_empty(struct crypt_device *cd, int *keyslot)
return 0;
}
/*
* compares UUIDs returned by device-mapper (striped by cryptsetup) and uuid in header
*/
static int crypt_uuid_cmp(const char *dm_uuid, const char *hdr_uuid)
{
int i, j;
char *str;
if (!dm_uuid || !hdr_uuid)
return -EINVAL;
str = strchr(dm_uuid, '-');
if (!str)
return -EINVAL;
for (i = 0, j = 1; hdr_uuid[i]; i++) {
if (hdr_uuid[i] == '-')
continue;
if (!str[j] || str[j] == '-')
return -EINVAL;
if (str[j] != hdr_uuid[i])
return -EINVAL;
j++;
}
return 0;
}
int PLAIN_activate(struct crypt_device *cd,
const char *name,
struct volume_key *vk,
@@ -642,6 +672,16 @@ int crypt_init_by_name_and_header(struct crypt_device **cd,
r = 0;
goto out;
}
/* checks whether UUIDs match each other */
r = crypt_uuid_cmp(dmd.uuid, (*cd)->hdr.uuid);
if (r < 0) {
log_dbg("LUKS device header uuid: %s mismatches DM returned uuid %s",
(*cd)->hdr.uuid, dmd.uuid);
free((*cd)->type);
(*cd)->type = NULL;
r = 0;
goto out;
}
}
}