Description:
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executing proc_open produces the following in the error log...

PHP Warning: proc_open(/home/vhosts/tmp/error-ANP-24551.txt) [function.proc-open]: failed to open stream: Operation not permitted in /home/xxx/object/xxx.php on line 222

PHP Warning: proc_open() [function.proc-open]: open_basedir restriction in effect. File(/home/vhosts/tmp/error-ANP-24551.txt) is not within the allowed path(s): (/var/www/:/home/vhosts/xxx.com/:/home/xxx/:/var/qmail/control/:/home/vhosts/lib/keys/:/home/vhosts/tmp/:/data1/backup_exempt/log/phpErrorLog/) in /home/xxx/object/xxx.php on line 222

Reproduce code:
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$descriptorspec = array(0 => array("pipe", "r"), 1 => array("pipe", "w"), 2 => array("file", '/home/vhosts/tmp/error-ANP-24551.txt', "a"));
$pipe = array();
$proc = "echo " . escapeshellarg($dataString) . " | /usr/bin/gpg -a -e --batch --no-secmem-warning --homedir " . $this->keyFileDir . " -r " . $this->encryptTo . " -o -";
$process = proc_open($proc, $descriptorspec, $pipe);


Expected result:
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proc_open should return a valid resource and data can be retreived with the following...

fclose($pipe[0]);
$data = stream_get_contents($pipe[1]);
fclose($pipe[1]);
proc_close($process);


Actual result:
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proc_open does not return a valid resource.  This code was working before the upgrade to php 5.2.3