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PERL5223DELTA(1pm)     Perl Programmers Reference Guide     PERL5223DELTA(1pm)


       perl5223delta - what is new for perl v5.22.3


       This document describes differences between the 5.22.2 release and the
       5.22.3 release.

       If you are upgrading from an earlier release such as 5.22.1, first read
       perl5222delta, which describes differences between 5.22.1 and 5.22.2.


   -Di switch is now required for PerlIO debugging output
       Previously PerlIO debugging output would be sent to the file specified
       by the "PERLIO_DEBUG" environment variable if perl wasn't running
       setuid and the -T or -t switches hadn't been parsed yet.

       If perl performed output at a point where it hadn't yet parsed its
       switches this could result in perl creating or overwriting the file
       named by "PERLIO_DEBUG" even when the -T switch had been supplied.

       Perl now requires the -Di switch to produce PerlIO debugging output.
       By default this is written to "stderr", but can optionally be
       redirected to a file by setting the "PERLIO_DEBUG" environment

       If perl is running setuid or the -T switch was supplied "PERLIO_DEBUG"
       is ignored and the debugging output is sent to "stderr" as for any
       other -D switch.

   Core modules and tools no longer search "." for optional modules
       The tools and many modules supplied in core no longer search the
       default current directory entry in @INC for optional modules.  For
       example, Storable will remove the final "." from @INC before trying to
       load Log::Agent.

       This prevents an attacker injecting an optional module into a process
       run by another user where the current directory is writable by the
       attacker, e.g. the /tmp directory.

       In most cases this removal should not cause problems, but difficulties
       were encountered with base, which treats every module name supplied as
       optional.  These difficulties have not yet been resolved, so for this
       release there are no changes to base.  We hope to have a fix for base
       in Perl 5.22.4.

       To protect your own code from this attack, either remove the default
       "."  entry from @INC at the start of your script, so:

         use strict;


         BEGIN { pop @INC if $INC[-1] eq '.' }
         use strict;

       or for modules, remove "." from a localized @INC, so:

         my $can_foo = eval { require Foo; }


         my $can_foo = eval {
             local @INC = @INC;
             pop @INC if $INC[-1] eq '.';
             require Foo;

Incompatible Changes

       Other than the security changes above there are no changes
       intentionally incompatible with Perl 5.22.2.  If any exist, they are
       bugs, and we request that you submit a report.  See "Reporting Bugs"

Modules and Pragmata

   Updated Modules and Pragmata
       o   Archive::Tar has been upgraded from version 2.04 to 2.04_01.

       o   bignum has been upgraded from version 0.39 to 0.39_01.

       o   CPAN has been upgraded from version 2.11 to 2.11_01.

       o   Digest has been upgraded from version 1.17 to 1.17_01.

       o   Digest::SHA has been upgraded from version 5.95 to 5.95_01.

       o   Encode has been upgraded from version 2.72 to 2.72_01.

       o   ExtUtils::Command has been upgraded from version 1.20 to 1.20_01.

       o   ExtUtils::MakeMaker has been upgraded from version 7.04_01 to

       o   File::Fetch has been upgraded from version 0.48 to 0.48_01.

       o   File::Spec has been upgraded from version 3.56_01 to 3.56_02.

       o   HTTP::Tiny has been upgraded from version 0.054 to 0.054_01.

       o   IO has been upgraded from version 1.35 to 1.35_01.

       o   The IO-Compress modules have been upgraded from version 2.068 to

       o   IPC::Cmd has been upgraded from version 0.92 to 0.92_01.

       o   JSON::PP has been upgraded from version 2.27300 to 2.27300_01.

       o   Locale::Maketext has been upgraded from version 1.26 to 1.26_01.

       o   Locale::Maketext::Simple has been upgraded from version 0.21 to

       o   Memoize has been upgraded from version 1.03 to 1.03_01.

       o   Module::CoreList has been upgraded from version 5.20160429 to

       o   Net::Ping has been upgraded from version 2.43 to 2.43_01.

       o   Parse::CPAN::Meta has been upgraded from version 1.4414 to

       o   Pod::Html has been upgraded from version 1.22 to 1.2201.

       o   Pod::Perldoc has been upgraded from version 3.25 to 3.25_01.

       o   Storable has been upgraded from version 2.53_01 to 2.53_02.

       o   Sys::Syslog has been upgraded from version 0.33 to 0.33_01.

       o   Test has been upgraded from version 1.26 to 1.26_01.

       o   Test::Harness has been upgraded from version 3.35 to 3.35_01.

       o   XSLoader has been upgraded from version 0.20 to 0.20_01, fixing a
           security hole in which binary files could be loaded from a path
           outside of @INC.  [GH #15418]


   Changes to Existing Documentation

       o   The documentation of "PERLIO_DEBUG" has been updated.


       o   The new -Di switch has been documented, and the documentation of
           "PERLIO_DEBUG" has been updated.


       o   A new test script, t/run/switchDx.t, has been added to test that
           the new -Di switch is working correctly.

Selected Bug Fixes

       o   The "PadlistNAMES" macro is an lvalue again.


       Perl 5.22.3 represents approximately 9 months of development since Perl
       5.22.2 and contains approximately 4,400 lines of changes across 240
       files from 20 authors.

       Excluding auto-generated files, documentation and release tools, there
       were approximately 2,200 lines of changes to 170 .pm, .t, .c and .h

       Perl continues to flourish into its third decade thanks to a vibrant
       community of users and developers.  The following people are known to
       have contributed the improvements that became Perl 5.22.3:

       Aaron Crane, Abigail, Alex Vandiver, Aristotle Pagaltzis, Chad Granum,
       Chris 'BinGOs' Williams, Craig A. Berry, David Mitchell, Father
       Chrysostomos, James E Keenan, Jarkko Hietaniemi, Karen Etheridge, Karl
       Williamson, Matthew Horsfall, Niko Tyni, Ricardo Signes, Sawyer X,
       Stevan Little, Steve Hay, Tony Cook.

       The list above is almost certainly incomplete as it is automatically
       generated from version control history.  In particular, it does not
       include the names of the (very much appreciated) contributors who
       reported issues to the Perl bug tracker.

       Many of the changes included in this version originated in the CPAN
       modules included in Perl's core.  We're grateful to the entire CPAN
       community for helping Perl to flourish.

       For a more complete list of all of Perl's historical contributors,
       please see the AUTHORS file in the Perl source distribution.

Reporting Bugs

       If you find what you think is a bug, you might check the articles
       recently posted to the comp.lang.perl.misc newsgroup and the Perl bug
       database at .  There may also be information at , the Perl Home Page.

       If you believe you have an unreported bug, please run the perlbug
       program included with your release.  Be sure to trim your bug down to a
       tiny but sufficient test case.  Your bug report, along with the output
       of "perl -V", will be sent off to to be analysed by
       the Perl porting team.

       If the bug you are reporting has security implications, which make it
       inappropriate to send to a publicly archived mailing list, then please
       send it to  This points to a closed
       subscription unarchived mailing list, which includes all the core
       committers, who will be able to help assess the impact of issues,
       figure out a resolution, and help co-ordinate the release of patches to
       mitigate or fix the problem across all platforms on which Perl is
       supported.  Please only use this address for security issues in the
       Perl core, not for modules independently distributed on CPAN.


       The Changes file for an explanation of how to view exhaustive details
       on what changed.

       The INSTALL file for how to build Perl.

       The README file for general stuff.

       The Artistic and Copying files for copyright information.

perl v5.34.0                      2021-05-04                PERL5223DELTA(1pm)

perl 5.34.0 - Generated Fri Feb 25 05:42:44 CST 2022
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