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Bug #74168 php://input is truncated
Submitted: 2017-02-25 23:46 UTC Modified: 2017-03-12 04:22 UTC
From: skaownz234 at gmail dot com Assigned: cmb (profile)
Status: No Feedback Package: JSON related
PHP Version: 7.0.16 OS: Centos 7 Minimal
Private report: No CVE-ID: None
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 [2017-02-25 23:46 UTC] skaownz234 at gmail dot com
Description:
------------
When sending JSON via php://input, my body was truncated at the point where it read <<<<<.  It seems that this signals php to stop reading in from php://input.  The JSON parse will fail since the truncation yields invalid JSON.  I'll send the JSON blob that causes the error via the patch file.  I remove the pattern /(<|>)+/ as a work around at the moment.

Here's where it fails:

d63da06809da5cf7c712":false},"is_super_like":false,"is_boost_match":false,"person":{"_id":"56c1d63da06809da5cf7c712","badges":[],"bio":"Why do guys put their height on here? Are we more compatible the taller we are? Let\'s test it:\\n\\n4\'10\\"\\nLibra\\nSarcastic\\nENFJ\\nType A\\nAmbitious\\nSapiosexual <<<<<<<<<<'

Pretty sure the <<<'s cause this.  Seems like the underlying stream processor has some sort of break condition dependent on the < symbols.

Test script:
---------------
POST something like {

<?php
$input = file_get_contents('php://input');
$j = json_decode(stripslashes(html_entity_decode($input)), true);
echo json_encode($j);
?>

Expected result:
----------------
All JSON data is received and retrievable via my $input variable for decoding.

Actual result:
--------------
JSON is truncated at an instance of '<<<<<<<<<<', rendering it invalid.

Patches

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History

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 [2017-02-26 13:44 UTC] cmb@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2017-02-26 13:44 UTC] cmb@php.net
> I'll send the JSON blob that causes the error via the patch file.

That does not work. Please provide the JSON somewhere else.

Also note that the input might be truncated due to post_max_size[1].

[1] <http://php.net/manual/en/ini.core.php#ini.post-max-size>
 [2017-02-26 14:08 UTC] spam2 at rhsoft dot net
shouldn't exceed post_max_size lead in an exception instead silently truncate input data?
 [2017-03-12 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.
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change the status of the bug back to "Re-Opened". Thank you.
 
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