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Bug #71955 shmop_open: creating infinite amount of segments
Submitted: 2016-04-04 09:10 UTC Modified: 2016-04-04 11:24 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: kakkau at grr dot la Assigned:
Status: Open Package: Unknown/Other Function
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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 [2016-04-04 09:10 UTC] kakkau at grr dot la 
Description:
------------
1. Run shmop_open with $key=0 and $flags="n" multiple times.
2. Wonder about a missing warning when using the same key for creation.
3. Check the output of ipcs -m. There should show up multiple segments now.

For other integers <> 0 shmop_open works as expected

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

$res = shmop_open(0,"n",0600,1024);
$res = shmop_open(0,"n",0600,1024);

?>

Expected result:
----------------
At least a warning should be thrown w/o creating another segment.

Warning: shmop_open(): unable to attach or create shared memory segment in php shell code on line 1

Call Stack:
   10.9282     120780   1. {main}() php shell code:0
   10.9282     120920   2. shmop_open() php shell code:1

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 [2016-04-04 09:17 UTC] requinix@php.net
-Package: PHP Language Specification +Package: Unknown/Other Function
 [2016-04-04 11:24 UTC] kakkau at grr dot la 
For segments that were opened via $key=0 it is additionally not possible to attach to them.

This snippet
<?php
shmop_open(0,"n",0600,1024);
shmop_open(0,"a",0600,1024);
?>

additionally fails with
Warning: shmop_open(): unable to attach or create shared memory segment in php shell code on line 1
 
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