From: [EMAIL PROTECTED]
Operating system: FreeBSD
PHP version: 5.0.0b3 (beta3)
PHP Bug Type: Reproducible crash
Bug description: gmp_powm() produces crash
Description:
------------
gmp_powm() crashes with a floating point exception when the third
parameter, the modulo, is called with a "0". This seems to be a problem
with GMP itself. I am using GMP 4.1.2. PHP could, however, check to see if
this parameter is 0, and call mpz_pow() instead.
Reproduce code:
---------------
<?php
$a = gmp_powm("2", "31", "0");
?>
Expected result:
----------------
$a = 2147483648;
Actual result:
--------------
Program terminated with signal 8, Arithmetic exception.
#0 0x281df6ce in __gmp_exception (error_bit=2) at errno.c:40
40 __gmp_junk = 10 / __gmp_0;
(gdb) bt
#0 0x281df6ce in __gmp_exception (error_bit=2) at errno.c:40
#1 0x00000206 in ?? ()
#2 0x0807b731 in zif_gmp_powm (ht=3, return_value=0x2820766c,
this_ptr=0x0, return_value_used=1)
at /usr/home/dave/php-5.0.0b3/ext/gmp/gmp.c:839
#3 0x0815e6ee in zend_do_fcall_common_helper (execute_data=0xbfbfe000,
op_array=0x81c2134)
at /usr/home/dave/php-5.0.0b3/Zend/zend_execute.c:2535
#4 0x0815bcef in execute (op_array=0x81c2134) at
/usr/home/dave/php-5.0.0b3/Zend/zend_execute.c:1260
#5 0x08145be7 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
at /usr/home/dave/php-5.0.0b3/Zend/zend.c:1048
#6 0x0811bf17 in php_execute_script (primary_file=0xbfbff6ec) at
/usr/home/dave/php-5.0.0b3/main/main.c:1638
#7 0x08164a1d in main (argc=2, argv=0xbfbff74c) at
/usr/home/dave/php-5.0.0b3/sapi/cli/php_cli.c:910
#8 0x0806d4a5 in _start ()
--
Edit bug report at http://bugs.php.net/?id=27172&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=27172&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=27172&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=27172&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=27172&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=27172&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=27172&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=27172&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=27172&r=support
Expected behavior: http://bugs.php.net/fix.php?id=27172&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=27172&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=27172&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=27172&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27172&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=27172&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=27172&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=27172&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=27172&r=float
