Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
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 wandering the Monastery: (3)
As of 2014-09-24 02:13 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How do you remember the number of days in each month?











    Results (244 votes), past polls