Actually, Safe has a share() method, which you should be able to use on STDIN--but it doesn't work for me:




use strict;
use warnings;
use 5.012;

use Safe;

if($ARGV[0]) {
    my $code = $ARGV[0];

    my $compartment = Safe->new;
    $compartment->share('*STDIN');
    $compartment->permit_only(qw{ print readline });
    $compartment->reval($code);

    if ($@) {
        print "Unsafe code detected: $@";
    }

}

--output:--

$ perl 2.pl '
print "Enter some stdin: ";
my $line = readline *STDIN;
print "From STDIN: $line";
'
Unsafe code detected: 'private value' trapped by operation mask at (ev
+al 5) line 1.

[download]

I can't even get share() to work on a simple scalar variable:

use strict;
use warnings;
use 5.012;

use Safe;

our $x = 10;

if($ARGV[0]) {
    my $code = $ARGV[0];

    my $compartment = Safe->new;
    $compartment->share('$x');
    $compartment->permit_only(qw{ print readline});
    $compartment->reval($code);

    if ($@) {
        print "Unsafe code detected: $@";
    }

}

--output:--
$ perl 2.pl 'print "$x\n";'
Unsafe code detected: 'private value' trapped by operation mask at (ev
+al 5) line 1.

[download]

I'm really sick of that non-informative error message!

In reply to Re: Passing argument into STDIN inside safe.pm reval by 7stud
in thread Passing argument into STDIN inside safe.pm reval by gideondsouza

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, 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.