Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

How can I tell if a variable is tainted?

by faq_monk (Initiate)
on Oct 08, 1999 at 00:27 UTC ( #689=perlfaq nodetype: print w/ replies, xml ) Need Help??

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

See Laundering and Detecting Tainted Data. Here's an example (which doesn't use any system calls, because the kill() is given no processes to signal):

    sub is_tainted {
        return ! eval { join('',@_), kill 0; 1; };
    }

This is not -w clean, however. There is no -w clean way to detect taintedness - take this as a hint that you should untaint all possibly-tainted data.

Log In?
Username:
Password:

What's my password?
Create A New User
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (18)
As of 2015-07-06 14:59 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (77 votes), past polls