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perl-5.44.0
⭐ Starred 2013 / Test2::Util::Facets2Legacy
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CVE-2026-15534 (2026-08-09)

Perl versions through 5.45.1 have out-of-bounds heap reads and writes during regular expression matching via an undersized superlinear cache in S_regmatch. The regex engine's superlinear cache holds one bit per subject position for each participating WHILEM node, so the bit count is the subject length plus one times the number of nodes. Nothing checks that product for positive overflow of the signed 32-bit count: a 286331153 byte subject matched against a pattern with 15 participating nodes stores the count as 14, leaving a two byte cache. The cache is then indexed from the real match position and node number, so reads go past the end of the allocation, and on failure CACHEsayNO sets a bit past it. A caller that matches an attacker controlled subject of this size against a pattern of this shape can crash the process or corrupt heap memory.

NAME

Test2::Util::Facets2Legacy - Convert facet data to the legacy event API.

DESCRIPTION

This module exports several subroutines from the older event API (see Test2::Event). These subroutines can be used as methods on any object that provides a custom facet_data() method. These subroutines can also be used as functions that take a facet data hashref as arguments.

SYNOPSIS

AS METHODS

package My::Event;

use Test2::Util::Facets2Legacy ':ALL';

sub facet_data { return { ... } }

Then to use it:

my $e = My::Event->new(...);

my $causes_fail = $e->causes_fail;
my $summary     = $e->summary;
....

AS FUNCTIONS

use Test2::Util::Facets2Legacy ':ALL';

my $f = {
    assert => { ... },
    info => [{...}, ...],
    control => {...},
    ...
};

my $causes_fail = causes_fail($f);
my $summary     = summary($f);

NOTE ON CYCLES

When used as methods, all these subroutines call $e->facet_data(). The default facet_data() method in Test2::Event relies on the legacy methods this module emulates in order to work. As a result of this it is very easy to create infinite recursion bugs.

These methods have cycle detection and will throw an exception early if a cycle is detected. uuid() is currently the only subroutine in this library that has a fallback behavior when cycles are detected.

EXPORTS

Nothing is exported by default. You must specify which methods to import, or use the ':ALL' tag.

$bool = $e->causes_fail()
$bool = causes_fail($f)

Check if the event or facets result in a failing state.

$bool = $e->diagnostics()
$bool = diagnostics($f)

Check if the event or facets contain any diagnostics information.

$bool = $e->global()
$bool = global($f)

Check if the event or facets need to be globally processed.

$bool = $e->increments_count()
$bool = increments_count($f)

Check if the event or facets make an assertion.

$bool = $e->no_display()
$bool = no_display($f)

Check if the event or facets should be rendered or hidden.

($max, $directive, $reason) = $e->sets_plan()
($max, $directive, $reason) = sets_plan($f)

Check if the event or facets set a plan, and return the plan details.

$id = $e->subtest_id()
$id = subtest_id($f)

Get the subtest id, if any.

$string = $e->summary()
$string = summary($f)

Get the summary of the event or facets hash, if any.

$undef_or_int = $e->terminate()
$undef_or_int = terminate($f)

Check if the event or facets should result in process termination, if so the exit code is returned (which could be 0). undef is returned if no termination is requested.

$uuid = $e->uuid()
$uuid = uuid($f)

Get the UUID of the facets or event.

Note: This will fall back to $e->SUPER::uuid() if a cycle is detected and an event is used as the argument.

SOURCE

The source code repository for Test2 can be found at https://github.com/Test-More/test-more/.

MAINTAINERS

Chad Granum <exodist@cpan.org>

AUTHORS

Chad Granum <exodist@cpan.org>

COPYRIGHT

Copyright Chad Granum <exodist@cpan.org>.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

See https://dev.perl.org/licenses/