#40273 [Opn->Bgs]: System slow down in php 5.2.0

ID: 40273 Updated by: tony2001@php.net Reported By: Jenei dot Viktor dot Attila at stud dot u-szeged dot hu -Status: Open +Status: Bogus Bug Type: Performance problem Operating System: Win32, Linux PHP Version: 5.2.0 New Comment: bcmath extension uses libbcmath, which actually does those math operations and we apparently cannot fix or improve this third-party library. There were no changes in ext/bcmath for years, so I doubt that it's appeared in 5.2.0. Not PHP problem. Previous Comments: ------------------------------------------------------------------------ [2007-01-29 13:29:22] Jenei dot Viktor dot Attila at stud dot u-szeged dot hu Description: ------------ In the bcmatch module can found a function called bcpow. If you called this with a big exponent, the compute will take a long. If you load this script many times, the system will hang up. The set_time_limit value don't help, because it is not an interpreted code. This code only usefull, if the attacker want to reboot/halt the server by the administrator. Reproduce code: --------------- denial_of_service.php: <?php echo bcpow(9,9999999); ?> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=40273&edit=1