php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Request #67374 Integer Overflow in Memory Usage Functions
Submitted: 2014-06-03 14:42 UTC Modified: 2017-03-16 20:24 UTC
Votes:6
Avg. Score:4.2 ± 0.7
Reproduced:5 of 6 (83.3%)
Same Version:3 (60.0%)
Same OS:2 (40.0%)
From: johannesdahse at gmx dot de Assigned: nikic (profile)
Status: Closed Package: PHP options/info functions
PHP Version: 5.5.13 OS:
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If this is not your bug, you can add a comment by following this link.
If this is your bug, but you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: johannesdahse at gmx dot de
New email:
PHP Version: OS:

 

 [2014-06-03 14:42 UTC] johannesdahse at gmx dot de 
Description:
------------
The memory usage functions memory_get_usage() and memory_get_peak_usage() are limited by INTEGER and can only store the memory usage of 2.147 GB. This results in false reports for higher memory usage.

Tested on Windows 7 64bit, PHP 5.5.13 (64bit and 32bit version).

Test script:
---------------
ini_set("memory_limit", "3G");

$a = array();
for($i=0; $i<22; $i++)
	$a[$i] = str_repeat("A", 100000000);

echo memory_get_peak_usage();

Expected result:
----------------
2200227928

Actual result:
--------------
-2094739216

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2014-07-05 23:18 UTC] yohgaki@php.net
-Type: Bug +Type: Feature/Change Request
 [2014-07-05 23:18 UTC] yohgaki@php.net 
I don't use windows often.
AFAIK, int is 32bit under windows regardless of architecture. Therefore, overflow is spec.

Is there any clean/feasible solution? Anyone?
 [2014-08-26 12:19 UTC] arie_dejong at msn dot com 
You can increase the limit by using the negative integer.

$bytes = memory_get_peak_usage();
if($bytes < 0){
	$bytes = PHP_INT_MAX + ($bytes - ~PHP_INT_MAX);
}
 [2015-11-05 08:41 UTC] samuel dot chemla at orange dot com 
Hi,

any new on this ?

memory_get_peak_usage() should return an int, which should be 64bit on 64bit systems, but it appears to be 32bit.

Any reason why ?

NB: I'm on PHP 5.5.30 x64 build on Windows 7 x64
 [2015-11-05 09:01 UTC] samuel dot chemla at orange dot com 
By the way this shoud be a bug, not a feature request...
 [2017-03-16 20:24 UTC] nikic@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: nikic
 [2017-03-16 20:24 UTC] nikic@php.net 
PHP 7 supports 64bit integers on LLP64 platforms. Of course you'll still get an overflow on 32bit builds, but there isn't much we can do about that.
 
PHP Copyright © 2001-2021 The PHP Group
All rights reserved. 		Last updated: Mon Apr 12 11:01:23 2021 UTC