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| author | Milan Broz <mbroz@redhat.com> | 2011-03-24 16:54:27 +0300 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-03-24 16:54:27 +0300 |
| commit | de8be5ac70f50a2340f24fd769a1aafa5a51ae34 (patch) | |
| tree | 1f4b7a5cddd6c6a78412a2dbd9ec071f00a41d1d | |
| parent | 3407ef5262b55ca5d7139d2b555ef792fe531eec (diff) | |
| download | linux-de8be5ac70f50a2340f24fd769a1aafa5a51ae34.tar.xz | |
dm crypt: wipe keys string immediately after key is set
Always wipe the original copy of the key after processing it
in crypt_set_key().
Signed-off-by: Milan Broz <mbroz@redhat.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
| -rw-r--r-- | drivers/md/dm-crypt.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 4e054bd91664..7dcae0d74db7 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -1331,20 +1331,29 @@ static int crypt_setkey_allcpus(struct crypt_config *cc) static int crypt_set_key(struct crypt_config *cc, char *key) { + int r = -EINVAL; + int key_string_len = strlen(key); + /* The key size may not be changed. */ - if (cc->key_size != (strlen(key) >> 1)) - return -EINVAL; + if (cc->key_size != (key_string_len >> 1)) + goto out; /* Hyphen (which gives a key_size of zero) means there is no key. */ if (!cc->key_size && strcmp(key, "-")) - return -EINVAL; + goto out; if (cc->key_size && crypt_decode_key(cc->key, key, cc->key_size) < 0) - return -EINVAL; + goto out; set_bit(DM_CRYPT_KEY_VALID, &cc->flags); - return crypt_setkey_allcpus(cc); + r = crypt_setkey_allcpus(cc); + +out: + /* Hex key string not needed after here, so wipe it. */ + memset(key, '0', key_string_len); + + return r; } static int crypt_wipe_key(struct crypt_config *cc) |