Safe::Hole(3pm)

💖 Safe::Hole 💖

okay bestie, so this whole thing lives in the User Contributed Perl Documentation bestie, and it's literally called Safe::Hole — and truly, the name ate 💅

🌸 NAME 🌸

Safe::Hole — make a hole to the original main compartment in the Safe compartment 🕳️✨

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🎀 SYNOPSIS 🎀

use Safe;
use Safe::Hole;
$cpt = new Safe;
$hole = new Safe::Hole {};
sub test { Test->test; }
$Testobj = new Test;
# $cpt->share('&test');  # alternate as next line
$hole->wrap(\&test, $cpt, '&test');
# ${$cpt->varglob('Testobj')} = $Testobj;  # alternate as next line
$hole->wrap($Testobj, $cpt, '$Testobj');
$cpt->reval('test; $Testobj->test;');
print $@ if $@;
package Test;
sub new { bless {},shift(); }
sub test { my $self = shift; $self->test2; }
sub test2 { print "Test->test2 called\n"; }

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✨ DESCRIPTION ✨

so here's the vibe. we can call outside-defined subroutines from the Safe compartment using share(), and we can call methods through an object that gets copied into the Safe compartment using varglob(). but — and this is the part that's giving 😭 — those subroutines or methods are executed in the Safe compartment too. which means they can't call another subroutine that's dynamically qualified with the package name (think class methods, iykyk), and they also can't compile code that uses opcodes that are forbidden inside the compartment. tragic, honestly.

but through Safe::Hole, we can execute outside-defined subroutines in the original main compartment from the Safe compartment. periodt. 🕳️👑

🫶 heads up bestie: if a subroutine called through Safe::Hole::call does a Carp::croak(), it will report the error as having occured within Safe::Hole. you can dodge this by including Safe::Hole::User in the @ISA for the package containing the subroutine. lowkey important!!

🦋 Methods 🦋

💜 new [NAMESPACE]

Class method. Backward compatible constructor.

NAMESPACE is the alternate root namespace that makes the compartment in which call() method execute the subroutine. Default of NAMESPACE means the current 'main'. This emulates the behaviour of Safe-Hole-0.08 and earlier. no cap, nostalgia vibes ✨

💜 new \%arguments

Class method. Constructor.

The constructor is called with a hash reference providing the constructor arguments. The argument ROOT specifies the alternate root namespace for the object. If the ROOT argument is not specified then the Safe::Hole object will attempt restore as much as it can of the environment in which it was constrtucted. This includes the opcode mask, %INC and @INC. If a root namespace is specified then it would not make sense to restore the %INC and @INC from main:: so this is not done. Also if a root namespace is given the opcode mask is not restored either. 🧚

💜 call $coderef [,@args]

Object method.

Call the subroutine refered by $coderef in the compartment that is specified with constructor new. @args are passed as the arguments to the called $coderef. Note that the arguments are not currently passed by reference although this may change in a future version. okay so watch this space fr fr 👀

💜 wrap $ref [,$cpt ,$name]

Object method.

• If $ref is a code reference, this method returns the anonymous subroutine reference that calls $ref using call() method of Safe::Hole (see above).
• If $ref is a class object, this method makes a wrapper class of that object and returns a new object of the wrapper class. Through the wrapper class, all original class methods called using call() method of Safe::Hole.
• If $cpt as Safe object and $name as subroutine or scalar name specified, this method works like share() method of Safe. When $ref is a code reference $name must like '&subroutine'. When $ref is a object $name must like '$var'.

Name $name may not be same as referent of $ref. For example:

$hole->wrap(\&foo, $cpt, '&bar');
$hole->wrap(sub{...}, $cpt, '&foo');
$hole->wrap($objfoo, $cpt, '$objbar');

💜 root

Object method. Return the namespace that is specified with constructor new(). If no namespace was then root() returns 'main'. 🏠✨

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⚠️ Warning ⚠️

You MUST NOT share the Safe::Hole object with the Safe compartment. If you do it the Safe compartment is NOT safe. like, at all. do not do this bestie, I am begging 🙈💀

This module provides a means to go from a state where an opcode is denied back to a state where it is not. Reasonable care has been taken to ensure that programs cannot simply manipulate the internals to the Safe::Hole object to reduce the opmask in effect. However there may still be a way that the authors have not considered. In particular it relies on the fact that a Perl program cannot change stuff inside the magic on a Perl variable. If you install a module that allows a Perl program to fiddle inside the magic then this assuption breaks down. One would hope that any system that was running un-trusted code would not have such a module installed. 👑🔒 (scary stuff, but like, forewarned is forearmed)

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🌈 AUTHORS 🌈

• Sey Nakajima <nakajima@netstock.co.jp> (Initial version)
• Brian McCauley <nobull@cpan.org> (Maintenance)
• Todd Rinaldo <toddr@cpan.org> (Maintenance)

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🌟 SEE ALSO 🌟

Safe(3).

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and that's the whole page bestie!! 🫶 this was perl v5.42.3, dated 2026-08-19, and it's the Safe::Hole(3pm) manual page — go forth and make holes responsibly 💖✨🎀🦋