Standard: use if available php_random_bytes() in mt_rand() / mt_srand().

Author: zeriyoshi

ext/standard/mt_rand.c

@@ -24,6 +24,7 @@
 
 #include "php.h"
 #include "php_rand.h"
+#include "php_random.h"
 #include "php_mt_rand.h"
 
 /* MT RAND FUNCTIONS */
@@ -161,7 +162,11 @@ PHPAPI uint32_t php_mt_rand(void)
 	register uint32_t s1;
 
 	if (UNEXPECTED(!BG(mt_rand_is_seeded))) {
-		php_mt_srand(GENERATE_SEED());
+		zend_long bytes;
+		if (php_random_bytes_silent(&bytes, sizeof(zend_long)) == FAILURE) {
+			bytes = GENERATE_SEED();
+		}
+		php_mt_srand(bytes);
 	}
 
 	if (BG(left) == 0) {
@@ -189,8 +194,11 @@ PHP_FUNCTION(mt_srand)
 		Z_PARAM_LONG(mode)
 	ZEND_PARSE_PARAMETERS_END();
 
-	if (ZEND_NUM_ARGS() == 0)
-		seed = GENERATE_SEED();
+	if (ZEND_NUM_ARGS() == 0) {
+		if (php_random_bytes_silent(&seed, sizeof(zend_long)) == FAILURE) {
+			seed = GENERATE_SEED();
+		}
+	}
 
 	switch (mode) {
 		case MT_RAND_PHP: