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