posix_uname() has been disabled for security reasons

Question

I have been getting this error message displayed as a header on the website and in the site error_log:

[18-Nov-2017 23:06:13 America/New_York] PHP Warning: posix_uname() has been disabled for security reasons in /home/reddirtr/public_html/holland_college_mw19/includes/GlobalFunctions.php on line 1450

How can I change the code in GlobalFunctions.php to remove the warning?

function wfHostname() {
static $host;
if ( is_null( $host ) ) {

    # Hostname overriding
    global $wgOverrideHostname;
    if ( $wgOverrideHostname !== false ) {
        # Set static and skip any detection
        $host = $wgOverrideHostname;
        return $host;
    }

    if ( function_exists( 'posix_uname' ) ) {
        // This function not present on Windows
        $uname = posix_uname();
    } else {
        $uname = false;
    }
    if ( is_array( $uname ) && isset( $uname['nodename'] ) ) {
        $host = $uname['nodename'];
    } elseif ( getenv( 'COMPUTERNAME' ) ) {
        # Windows computer name
        $host = getenv( 'COMPUTERNAME' );
    } else {
        # This may be a virtual server.
        $host = $_SERVER['SERVER_NAME'];
    }
}
return $host;

}

score 0 · Answer 1 · answered Nov 19 '17 at 10:14

0

You can use the @ character to hide any error messages generated from that expression:

PHP supports one error control operator: the at sign (@). When prepended to an expression in PHP, any error messages that might be generated by that expression will be ignored.

You can use it as follow:

if ( function_exists( 'posix_uname' ) ) {
    // This function not present on Windows
    $uname = @posix_uname();
} else {
    $uname = false;
}

Keep in mind that it doesn't fix the problem, it just hides the error message. Also, you can read the chapter "Errors -> Basic" for basic configurations to hide/show error messages in your script.

answered Nov 19 '17 at 10:14

Progman

16,827
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The use of the '@' sign as you indicated did the trick and suppressed the error message I was getting. Thank you. How could I change that statement to force the variable $uname to be false? – Ron K. Nov 19 '17 at 14:04
@RonK. You can check the result of that statement when the function is blocked. I guess it will be `null` so you can check against it. – Progman Nov 19 '17 at 14:15

score 0 · Answer 2 · edited May 30 '18 at 06:45

0

By default, the server blocks some functions if any suspicious activities occur. So, try editing the php.ini file by adding

disable_functions=

that function sets disable_functions to none. You can add some functions if you need to.

edited May 30 '18 at 06:45

CJ Dennis

4,226
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answered May 30 '18 at 06:17

Santosh Reddy

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posix_uname() has been disabled for security reasons

2 Answers2