eCryptfs: Add mount option for cipher mode

index 2f6735d..995b324 100644
@@ -620,7 +620,8 @@ int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat)
 		goto out_unlock;
 	}
 	rc = ecryptfs_crypto_api_algify_cipher_name(&full_alg_name,
-						    crypt_stat->cipher, "cbc");
+						crypt_stat->cipher,
+						crypt_stat->cipher_mode);
 	if (rc)
 		goto out_unlock;
 	crypt_stat->tfm = crypto_alloc_ablkcipher(full_alg_name, 0, 0);

@@ -792,6 +793,7 @@ static void ecryptfs_set_default_crypt_stat_vals(
 						      mount_crypt_stat);
 	ecryptfs_set_default_sizes(crypt_stat);
 	strcpy(crypt_stat->cipher, ECRYPTFS_DEFAULT_CIPHER);
+	strcpy(crypt_stat->cipher_mode, ECRYPTFS_DEFAULT_CIPHER_MODE);
 	crypt_stat->key_size = ECRYPTFS_DEFAULT_KEY_BYTES;
 	crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID);
 	crypt_stat->file_version = ECRYPTFS_FILE_VERSION;

@@ -825,6 +827,7 @@ int ecryptfs_new_file_context(struct inode *ecryptfs_inode)
 	    &ecryptfs_superblock_to_private(
 		    ecryptfs_inode->i_sb)->mount_crypt_stat;
 	int cipher_name_len;
+	int cipher_mode_name_len;
 	int rc = 0;
 
 	ecryptfs_set_default_crypt_stat_vals(crypt_stat, mount_crypt_stat);

@@ -844,6 +847,12 @@ int ecryptfs_new_file_context(struct inode *ecryptfs_inode)
 	       mount_crypt_stat->global_default_cipher_name,
 	       cipher_name_len);
 	crypt_stat->cipher[cipher_name_len] = '\0';
+	cipher_mode_name_len =
+		strlen(mount_crypt_stat->global_default_cipher_mode_name);
+	memcpy(crypt_stat->cipher_mode,
+		mount_crypt_stat->global_default_cipher_mode_name,
+		cipher_mode_name_len);
+	crypt_stat->cipher_mode[cipher_mode_name_len] = '\0';
 	crypt_stat->key_size =
 		mount_crypt_stat->global_default_cipher_key_size;
 	ecryptfs_generate_new_key(crypt_stat);

index 90d1882..dae2e1d 100644
@@ -125,6 +125,7 @@ ecryptfs_get_key_payload_data(struct key *key)
 
 #define ECRYPTFS_MAX_KEYSET_SIZE 1024
 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
+#define ECRYPTFS_MAX_CIPHER_MODE_NAME_SIZE 32
 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64
 #define ECRYPTFS_MAX_IV_BYTES 16	/* 128 bits */
 #define ECRYPTFS_SALT_BYTES 2

@@ -134,6 +135,7 @@ ecryptfs_get_key_payload_data(struct key *key)
 #define ECRYPTFS_SIZE_AND_MARKER_BYTES (ECRYPTFS_FILE_SIZE_BYTES \
 					+ MAGIC_ECRYPTFS_MARKER_SIZE_BYTES)
 #define ECRYPTFS_DEFAULT_CIPHER "aes"
+#define ECRYPTFS_DEFAULT_CIPHER_MODE "cbc"
 #define ECRYPTFS_DEFAULT_KEY_BYTES 16
 #define ECRYPTFS_DEFAULT_HASH "md5"
 #define ECRYPTFS_TAG_70_DIGEST ECRYPTFS_DEFAULT_HASH

@@ -238,6 +240,7 @@ struct ecryptfs_crypt_stat {
 	struct crypto_hash *hash_tfm; /* Crypto context for generating
 				       * the initialization vectors */
 	unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
+	unsigned char cipher_mode[ECRYPTFS_MAX_CIPHER_MODE_NAME_SIZE];
 	unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
 	unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
 	struct list_head keysig_list;

@@ -342,6 +345,8 @@ struct ecryptfs_mount_crypt_stat {
 	size_t global_default_fn_cipher_key_bytes;
 	unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
 						 + 1];
+	unsigned char global_default_cipher_mode_name[
+		ECRYPTFS_MAX_CIPHER_MODE_NAME_SIZE + 1];
 	unsigned char global_default_fn_cipher_name[
 		ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
 	char global_default_fnek_sig[ECRYPTFS_SIG_SIZE_HEX + 1];

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