PERL5241DELTA(1) Perl Programmers Reference Guide PERL5241DELTA(1) #
PERL5241DELTA(1) Perl Programmers Reference Guide PERL5241DELTA(1)
NNAAMMEE #
perl5241delta - what is new for perl v5.24.1
DDEESSCCRRIIPPTTIIOONN #
This document describes differences between the 5.24.0 release and the
5.24.1 release.
If you are upgrading from an earlier release such as 5.22.0, first read
perl5240delta, which describes differences between 5.22.0 and 5.24.0.
SSeeccuurriittyy --DDii sswwiittcchh iiss nnooww rreeqquuiirreedd ffoorr PPeerrllIIOO ddeebbuuggggiinngg oouuttppuutt 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 --TT or --tt 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 --TT switch had been supplied.
Perl now requires the --DDii 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 variable.
If perl is running setuid or the --TT switch was supplied "PERLIO_DEBUG" is
ignored and the debugging output is sent to "stderr" as for any other --DD
switch.
CCoorree mmoodduulleess aanndd ttoooollss nnoo lloonnggeerr sseeaarrcchh _"_._" ffoorr ooppttiioonnaall mmoodduulleess 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 _/_t_m_p 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 5.24.2.
To protect your own code from this attack, either remove the default _"_._"
entry from @INC at the start of your script, so:
#!/usr/bin/perl
use strict;
...
becomes:
#!/usr/bin/perl
BEGIN { pop @INC if $INC[-1] eq '.' }
use strict;
...
or for modules, remove _"_._" from a localized @INC, so:
my $can_foo = eval { require Foo; }
becomes:
my $can_foo = eval {
local @INC = @INC;
pop @INC if $INC[-1] eq '.';
require Foo;
};
IInnccoommppaattiibbllee CChhaannggeess Other than the security changes above there are no changes intentionally incompatible with Perl 5.24.0. If any exist, they are bugs, and we request that you submit a report. See “Reporting Bugs” below.
MMoodduulleess aanndd PPrraaggmmaattaa UUppddaatteedd MMoodduulleess aanndd PPrraaggmmaattaa • Archive::Tar has been upgraded from version 2.04 to 2.04_01.
• bignum has been upgraded from version 0.42 to 0.42_01.
• CPAN has been upgraded from version 2.11 to 2.11_01.
• Digest has been upgraded from version 1.17 to 1.17_01.
• Digest::SHA has been upgraded from version 5.95 to 5.95_01.
• Encode has been upgraded from version 2.80 to 2.80_01.
• ExtUtils::MakeMaker has been upgraded from version 7.10_01 to
7.10_02.
• File::Fetch has been upgraded from version 0.48 to 0.48_01.
• File::Spec has been upgraded from version 3.63 to 3.63_01.
• HTTP::Tiny has been upgraded from version 0.056 to 0.056_001.
• IO has been upgraded from version 1.36 to 1.36_01.
• The IO-Compress modules have been upgraded from version 2.069 to
2.069_001.
• IPC::Cmd has been upgraded from version 0.92 to 0.92_01.
• JSON::PP has been upgraded from version 2.27300 to 2.27300_01.
• Locale::Maketext has been upgraded from version 1.26 to 1.26_01.
• Locale::Maketext::Simple has been upgraded from version 0.21 to
0.21_01.
• Memoize has been upgraded from version 1.03 to 1.03_01.
• Module::CoreList has been upgraded from version 5.20160506 to
5.20170114_24.
• Net::Ping has been upgraded from version 2.43 to 2.43_01.
• Parse::CPAN::Meta has been upgraded from version 1.4417 to
1.4417_001.
• Pod::Html has been upgraded from version 1.22 to 1.2201.
• Pod::Perldoc has been upgraded from version 3.25_02 to 3.25_03.
• Storable has been upgraded from version 2.56 to 2.56_01.
• Sys::Syslog has been upgraded from version 0.33 to 0.33_01.
• Test has been upgraded from version 1.28 to 1.28_01.
• Test::Harness has been upgraded from version 3.36 to 3.36_01.
• XSLoader has been upgraded from version 0.21 to 0.22, fixing a
security hole in which binary files could be loaded from a path
outside of @INC. [GH #15418]
<https://github.com/Perl/perl5/issues/15418>
DDooccuummeennttaattiioonn CChhaannggeess ttoo EExxiissttiinngg DDooccuummeennttaattiioonn _p_e_r_l_a_p_i_o
• The documentation of "PERLIO_DEBUG" has been updated.
_p_e_r_l_r_u_n
• The new --DDii switch has been documented, and the documentation of
"PERLIO_DEBUG" has been updated.
TTeessttiinngg • A new test script, _t_/_r_u_n_/_s_w_i_t_c_h_D_x_._t, has been added to test that the new --DDii switch is working correctly.
SSeelleecctteedd BBuugg FFiixxeess • The change to hashbang redirection introduced in Perl 5.24.0, whereby perl would redirect to another interpreter (Perl 6) if it found a hashbang path which contains “perl” followed by “6”, has been reverted because it broke in cases such as “#!/opt/perl64/bin/perl”.
AAcckknnoowwlleeddggeemmeennttss Perl 5.24.1 represents approximately 8 months of development since Perl 5.24.0 and contains approximately 8,100 lines of changes across 240 files from 18 authors.
Excluding auto-generated files, documentation and release tools, there
were approximately 2,200 lines of changes to 170 .pm, .t, .c and .h
files.
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 5.24.1:
Aaron Crane, Alex Vandiver, Aristotle Pagaltzis, Chad Granum, Chris
'BinGOs' Williams, Craig A. Berry, Father Chrysostomos, James E Keenan,
Jarkko Hietaniemi, Karen Etheridge, Leon Timmermans, Matthew Horsfall,
Ricardo Signes, Sawyer X, Sébastien Aperghis-Tramoni, 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 _A_U_T_H_O_R_S file in the Perl source distribution.
RReeppoorrttiinngg BBuuggss 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 https://rt.perl.org/ . There may also be information at http://www.perl.org/ , 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 perlbug@perl.org 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 see
"SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of
how to report the issue.
SSEEEE AALLSSOO #
The _C_h_a_n_g_e_s file for an explanation of how to view exhaustive details on
what changed.
The _I_N_S_T_A_L_L file for how to build Perl.
The _R_E_A_D_M_E file for general stuff.
The _A_r_t_i_s_t_i_c and _C_o_p_y_i_n_g files for copyright information.
perl v5.36.3 2023-02-15 PERL5241DELTA(1)