Fix bug #75409

Author: paragonie-scott

NEWS

@@ -17,6 +17,8 @@ PHP                                                                        NEWS
 - Standard:
   . Fixed bug #75535 (Inappropriately parsing HTTP response leads to PHP
     segment fault). (Nikita)
+  . Fixed bug #75409 (accept EFAULT in addition to ENOSYS as indicator 
+    that getrandom() is missing). (sarciszewski)
 
 - Zip:
   . Fixed bug #75540 (Segfault with libzip 1.3.1). (Remi)

ext/standard/random.c

@@ -122,16 +122,10 @@ PHPAPI int php_random_bytes(void *bytes, size_t size, zend_bool should_throw)
 			} else if (errno == EINTR || errno == EAGAIN) {
 				/* Try again */
 				continue;
+			} else {
+			    /* If the syscall fails, fall back to reading from /dev/urandom */
+				break;
 			}
-			/*
-				If the syscall fails, we are doomed. The loop that calls
-				php_random_bytes should be terminated by the exception instead
-				of proceeding to demand more entropy.
-			*/
-			if (should_throw) {
-				zend_throw_exception(zend_ce_exception, "Could not gather sufficient random data", errno);
-			}
-			return FAILURE;
 		}
 
 		read_bytes += (size_t) n;