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Bug #61636 readfile() resp. fpassthru() try to allocate complete file into memory
Submitted: 2012-04-05 12:31 UTC Modified: 2021-02-14 04:22 UTC
Votes:11
Avg. Score:3.9 ± 1.2
Reproduced:10 of 10 (100.0%)
Same Version:1 (10.0%)
Same OS:5 (50.0%)
From: kontrollfreak at arcor dot de Assigned: cmb (profile)
Status: No Feedback Package: Apache related
PHP Version: master-Git-2012-04-05 (snap) OS: Windows XP SP3
Private report: No CVE-ID: None
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 [2012-04-05 12:31 UTC] kontrollfreak at arcor dot de
Description:
------------
Tested on:
- PHP 5.5.0dev (r324251) as Apache 2.2 module
- Apache 2.2.22

This bug applies to the Apache module on Windows only. The cgi version does not show this behavior.

I narrowed it down to PHP 5.2.10. Before that version the test script runs without error.

Test script:
---------------
<?php

//test.bin has 200 MB
readfile('test.bin');

?>

Expected result:
----------------
No error

Actual result:
--------------
Immediate result (doesn't even begin to load the file):

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 209719296 bytes) in C:*\readfile.php on line 4

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 [2012-11-09 23:52 UTC] kv3981 at gmail dot com
Same issue on
--------------
- Debian Squeeze 6.0.6
- PHP 5.3.3-7+squeeze14
- Default php.ini, with memory_limit 128M 128M

Workaround
-----------
<?php
// Reads large file, fixes: https://bugs.php.net/bug.php?id=61636	
function readlargefile($fullfile) {
	$fp = fopen($fullfile, 'rb');
	
	if ($fp) {
		while (!feof($fp)) {
			print(fread($fp, 2097152));
		}
	
		fclose($fp);
	}
}
?>
 [2013-02-10 20:00 UTC] fredericg_99 at yahoo dot fr
I can confirm that the problem exists on PHP 5.3.16.
However, the problem does not appear for every files, but once it appears on a file, it applies for every attempts on that file (and not necessarily for the others).
The proposed workaround works.
 [2013-04-14 11:18 UTC] kontrollfreak at arcor dot de
(Windows only)
kv3981 at gmail dot com's solution works as long as the transfer does not take longer than max_execution_time.
 [2013-04-14 12:55 UTC] pajoye@php.net
-Status: Open +Status: Feedback
 [2013-04-14 12:55 UTC] pajoye@php.net
Be sure to disable output buffering, see http://www.php.net/readfile
 [2013-04-14 13:59 UTC] kontrollfreak at arcor dot de
In reply to [2013-04-14 12:55 UTC] pajoye@php.net:

During the test output buffering was disabled by the following snippet.

Disable output buffering:
-------------------------
<?php
while (ob_get_level())
 ob_end_flush();
?>
 [2013-04-14 13:59 UTC] kontrollfreak at arcor dot de
-: nachnamev2 at t-online dot de +: kontrollfreak at arcor dot de -Status: Feedback +Status: Open
 [2013-04-15 04:21 UTC] pajoye@php.net
-Status: Open +Status: Feedback
 [2013-04-15 04:21 UTC] pajoye@php.net
And you still got the out of memory error?
 [2013-04-15 07:06 UTC] kontrollfreak at arcor dot de
To be sure, I reran the test this morning under following conditions:
---------------------------------------------------------------------

- Windows XP SP3
- Apache 2.4.4 from http://www.apachelounge.com/download/win32/binaries/httpd-2.4.4-win32.zip
- PHP 5.4.14 from http://windows.php.net/downloads/releases/php-5.4.14-Win32-VC9-x86.zip

httpd.conf:
-----------
LoadModule authz_core_module modules/mod_authz_core.so
LoadModule php5_module       modules/php5apache2_4.dll

Listen 80

LogLevel trace8

DocumentRoot htdocs

<FilesMatch "\.php$">
    SetHandler application/x-httpd-php
</FilesMatch>

php.ini:
--------
*empty*

Test script:
------------
<?php

error_reporting(-1);

while(ob_get_level())
    ob_end_flush();

header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="test.bin"');
header('Content-Length: 209715200');
readfile('test.bin');

?>

Expected result:
----------------
A download of file "test.bin" containing 200 MB of NUL bytes

Actual result:
--------------
The result has changed. I do not get the out of memory error anymore. Instead Firefox 20.0.1 shows the following:

The connection was reset
    The connection to the server was reset while the page was loading.

Apache error.log:
-----------------
[Mon Apr 15 09:03:29.719610 2013] [core:trace3] [pid 2588:tid 1884] core.c(3034): Setting LogLevel for all modules to trace8
[Mon Apr 15 09:03:29.749653 2013] [mpm_winnt:notice] [pid 2588:tid 1884] AH00455: Apache/2.4.4 (Win32) PHP/5.4.14 configured -- resuming normal operations
[Mon Apr 15 09:03:29.749653 2013] [mpm_winnt:notice] [pid 2588:tid 1884] AH00456: Server built: Feb 23 2013 16:24:03
[Mon Apr 15 09:03:29.749653 2013] [core:notice] [pid 2588:tid 1884] AH00094: Command line: 'httpd -d C:/Apache24'
[Mon Apr 15 09:03:29.759668 2013] [mpm_winnt:notice] [pid 2588:tid 1884] AH00418: Parent: Created child process 2576
[Mon Apr 15 09:03:29.759668 2013] [mpm_winnt:debug] [pid 2588:tid 1884] mpm_winnt.c(422): AH00402: Parent: Sent the scoreboard to the child
[Mon Apr 15 09:03:30.230345 2013] [core:trace3] [pid 2576:tid 1868] core.c(3034): Setting LogLevel for all modules to trace8
[Mon Apr 15 09:03:30.280417 2013] [core:trace3] [pid 2576:tid 1868] core.c(3034): Setting LogLevel for all modules to trace8
[Mon Apr 15 09:03:30.300445 2013] [mpm_winnt:debug] [pid 2576:tid 1868] mpm_winnt.c(1708): AH00453: Child process is running
[Mon Apr 15 09:03:30.300445 2013] [mpm_winnt:debug] [pid 2588:tid 1884] mpm_winnt.c(505): AH00408: Parent: Duplicating socket 1892 (0.0.0.0:80) and sending it to child process 2576
[Mon Apr 15 09:03:30.300445 2013] [mpm_winnt:debug] [pid 2588:tid 1884] mpm_winnt.c(524): AH00411: Parent: Sent 1 listeners to child 2576
[Mon Apr 15 09:03:30.300445 2013] [core:trace4] [pid 2588:tid 1884] mpm_common.c(526): mpm child 2576 (gen 0/slot 0) started
[Mon Apr 15 09:03:30.300445 2013] [mpm_winnt:debug] [pid 2576:tid 1868] mpm_winnt.c(343): AH00391: Child: Retrieved our scoreboard from the parent.
[Mon Apr 15 09:03:30.300445 2013] [mpm_winnt:debug] [pid 2576:tid 1868] mpm_winnt.c(458): AH00403: Child: Waiting for data for listening socket 0.0.0.0:80
[Mon Apr 15 09:03:30.300445 2013] [mpm_winnt:debug] [pid 2576:tid 1868] mpm_winnt.c(483): AH00407: Child: retrieved 1 listeners from parent
[Mon Apr 15 09:03:30.300445 2013] [mpm_winnt:debug] [pid 2576:tid 1868] child.c(955): AH00352: Child: Acquired the start mutex.
[Mon Apr 15 09:03:30.300445 2013] [mpm_winnt:notice] [pid 2576:tid 1868] AH00354: Child: Starting 64 worker threads.
[Mon Apr 15 09:03:30.310460 2013] [mpm_winnt:debug] [pid 2576:tid 1252] child.c(354): AH00334: Child: Accept thread listening on 0.0.0.0:80 using AcceptFilter data
[Mon Apr 15 09:03:33.444967 2013] [core:trace5] [pid 2576:tid 1260] protocol.c(622): [client 127.0.0.1:1146] Request received from client: GET /test.php HTTP/1.1
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_request.c(300): [client 127.0.0.1:1146] Headers received from client:
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_request.c(303): [client 127.0.0.1:1146]   Host: localhost
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_request.c(303): [client 127.0.0.1:1146]   User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:20.0) Gecko/20100101 Firefox/20.0
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_request.c(303): [client 127.0.0.1:1146]   Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_request.c(303): [client 127.0.0.1:1146]   Accept-Language: en-US,en;q=0.5
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_request.c(303): [client 127.0.0.1:1146]   Accept-Encoding: gzip, deflate
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_request.c(303): [client 127.0.0.1:1146]   Connection: keep-alive
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_request.c(303): [client 127.0.0.1:1146]   Cache-Control: max-age=0
[Mon Apr 15 09:03:33.444967 2013] [authz_core:debug] [pid 2576:tid 1260] mod_authz_core.c(827): [client 127.0.0.1:1146] AH01628: authorization result: granted (no directives)
[Mon Apr 15 09:03:33.444967 2013] [core:trace3] [pid 2576:tid 1260] request.c(225): [client 127.0.0.1:1146] request authorized without authentication by access_checker_ex hook: /test.php
[Mon Apr 15 09:03:33.444967 2013] [http:trace3] [pid 2576:tid 1260] http_filters.c(960): [client 127.0.0.1:1146] Response sent with status 200, headers:
[Mon Apr 15 09:03:33.444967 2013] [http:trace5] [pid 2576:tid 1260] http_filters.c(969): [client 127.0.0.1:1146]   Date: Mon, 15 Apr 2013 07:03:33 GMT
[Mon Apr 15 09:03:33.444967 2013] [http:trace5] [pid 2576:tid 1260] http_filters.c(972): [client 127.0.0.1:1146]   Server: Apache/2.4.4 (Win32) PHP/5.4.14
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_filters.c(804): [client 127.0.0.1:1146]   X-Powered-By: PHP/5.4.14
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_filters.c(804): [client 127.0.0.1:1146]   Content-Disposition: attachment; filename=\\"test.bin\\"
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_filters.c(804): [client 127.0.0.1:1146]   Content-Length: 209715200
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_filters.c(804): [client 127.0.0.1:1146]   Keep-Alive: timeout=5, max=100
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_filters.c(804): [client 127.0.0.1:1146]   Connection: Keep-Alive
[Mon Apr 15 09:03:33.444967 2013] [http:trace4] [pid 2576:tid 1260] http_filters.c(804): [client 127.0.0.1:1146]   Content-Type: application/octet-stream
[Mon Apr 15 09:03:33.444967 2013] [core:trace6] [pid 2576:tid 1260] core_filters.c(523): [client 127.0.0.1:1146] core_output_filter: flushing because of THRESHOLD_MAX_BUFFER
 [2013-04-15 07:06 UTC] kontrollfreak at arcor dot de
-Status: Feedback +Status: Open
 [2021-02-03 13:46 UTC] cmb@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2021-02-03 13:46 UTC] cmb@php.net
Is this still an issue with any of the actively supported PHP
versions[1]?

[1] <https://www.php.net/supported-versions.php>
 [2021-02-14 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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