Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
when I first started reading about taint mode, I expected that it would identify every single instance of tainted variable and force me to look at it explicitly.
It does! What it cannot do -- which you seem to be expecting -- is decide whether you looked closely enough.

I understand that it's my responsability to make sure I have looked at the input closely enough. My issue is that Perl tries to "guess" when I have looked at the the input ("gee, the programmer captured some match groups from a regexp match on that input, so it MUST mean that he sanitized it"), instead of letting me tell it when I think I have looked at it closely enough (for example, but invoking a method untainted() on a variable).

Using your front desk metaphor, suppose I am a security guard patrolling the corridors of a building. As I go through the front gate in the morning, I notice my front desk colleague making eye contact with a visitor. Later on, I see this visitor wandering the corridors without a pass. Can I assume that this visitor is authorized just because my colleague made eye contact with him? No, of course not!


In reply to Re^2: Taint mode limitations by alain_desilets
in thread Taint mode limitations by alain_desilets

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • 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 taking refuge in the Monastery: (9)
    As of 2015-07-28 09:33 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 (254 votes), past polls