Use /dev/urandom as the default mcrypt_create_iv() source

Also fixes the ARGINFO for mcrypt_create_iv() and adds missing
UPGRADING entries.

NEWS

@@ -23,7 +23,7 @@ PHP                                                                        NEWS
     CVE-2013-7327). (Tomas Hoger, Remi).
 
 - Hash:
-  . Fixed buf #66698 (Missing FNV1a32 and FNV1a64 hash functions).
+  . Fixed bug #66698 (Missing FNV1a32 and FNV1a64 hash functions).
     (Michael M Slusarz).
 
 - Mail:
@@ -33,6 +33,7 @@ PHP                                                                        NEWS
   . No longer allow invalid key sizes, invalid IV sizes or missing required IV
     in mcrypt_encrypt, mcrypt_decrypt and the deprecated mode functions.
     (Nikita)
+  . Use /dev/urandom as the default source for mcrypt_create_iv(). (Nikita)
 
 - MySQLi:
   . Fixed bug #66762 (Segfault in mysqli_stmt::bind_result() when link closed)

UPGRADING

@@ -41,6 +41,11 @@ PHP 5.6 UPGRADE NOTES
   context options, so most users should be unaffected by this transparent
   security enhancement. (https://wiki.php.net/rfc/tls-peer-verification)
 
+- Mcrypt:
+  The mcrypt_encrypt(), mcrypt_decrypt() and mcrypt_{MODE}() functions no
+  longer accept keys or IVs with incorrect sizes. Furthermore an IV is now
+  required if the used block cipher mode requires it.
+
 ========================================
 2. New Features
 ========================================
@@ -159,6 +164,10 @@ PHP 5.6 UPGRADE NOTES
   crypt() will now raise an E_NOTICE error if the salt parameter is omitted.
   See: https://wiki.php.net/rfc/crypt_function_salt
 
+- Mcrypt:
+  The $source parameter of mcrypt_create_iv() now defaults to
+  MCRYPT_DEV_URANDOM instead of MCRYPT_DEV_RANDOM.
+
 - XMLReader:
   XMLReader::getAttributeNs and XMLReader::getAttributeNo now return NULL if
   the attribute could not be found, just like XMLReader::getAttribute.

ext/mcrypt/mcrypt.c

@@ -232,7 +232,7 @@ ZEND_BEGIN_ARG_INFO_EX(arginfo_mcrypt_ofb, 0, 0, 5)
 	ZEND_ARG_INFO(0, iv)
 ZEND_END_ARG_INFO()
 
-ZEND_BEGIN_ARG_INFO_EX(arginfo_mcrypt_create_iv, 0, 0, 2)
+ZEND_BEGIN_ARG_INFO_EX(arginfo_mcrypt_create_iv, 0, 0, 1)
 	ZEND_ARG_INFO(0, size)
 	ZEND_ARG_INFO(0, source)
 ZEND_END_ARG_INFO()
@@ -313,6 +313,12 @@ ZEND_GET_MODULE(mcrypt)
 #define MCRYPT_ENCRYPT 0
 #define MCRYPT_DECRYPT 1
 
+typedef enum {
+	RANDOM = 0,
+	URANDOM,
+	RAND
+} iv_source;
+
 #define MCRYPT_GET_INI											\
 	cipher_dir_string = MCG(algorithms_dir); 					\
 	module_dir_string = MCG(modes_dir);
@@ -384,9 +390,9 @@ static PHP_MINIT_FUNCTION(mcrypt) /* {{{ */
 	REGISTER_LONG_CONSTANT("MCRYPT_DECRYPT", 1, CONST_PERSISTENT);
 
 	/* sources for mcrypt_create_iv */
-	REGISTER_LONG_CONSTANT("MCRYPT_DEV_RANDOM", 0, CONST_PERSISTENT);
-	REGISTER_LONG_CONSTANT("MCRYPT_DEV_URANDOM", 1, CONST_PERSISTENT);
-	REGISTER_LONG_CONSTANT("MCRYPT_RAND", 2, CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("MCRYPT_DEV_RANDOM", RANDOM, CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("MCRYPT_DEV_URANDOM", URANDOM, CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("MCRYPT_RAND", RAND, CONST_PERSISTENT);
 
 	/* ciphers */
 	MCRYPT_ENTRY2_2_4(3DES, "tripledes");
@@ -495,12 +501,6 @@ PHP_MINFO_FUNCTION(mcrypt) /* {{{ */
 }
 /* }}} */
 
-typedef enum {
-	RANDOM = 0,
-	URANDOM,
-	RAND
-} iv_source;
-
 /* {{{ proto resource mcrypt_module_open(string cipher, string cipher_directory, string mode, string mode_directory)
    Opens the module of the algorithm and the mode to be used */
 PHP_FUNCTION(mcrypt_module_open)
@@ -1393,7 +1393,7 @@ PHP_FUNCTION(mcrypt_ofb)
 PHP_FUNCTION(mcrypt_create_iv)
 {
 	char *iv;
-	long source = RANDOM;
+	long source = URANDOM;
 	long size;
 	int n = 0;