PERL5243DELTA(1) Perl Programmers Reference Guide PERL5243DELTA(1) #

PERL5243DELTA(1) Perl Programmers Reference Guide PERL5243DELTA(1)

NNAAMMEE #

 perl5243delta - what is new for perl v5.24.3

DDEESSCCRRIIPPTTIIOONN #

 This document describes differences between the 5.24.2 release and the
 5.24.3 release.

 If you are upgrading from an earlier release such as 5.24.1, first read
 perl5242delta, which describes differences between 5.24.1 and 5.24.2.

SSeeccuurriittyy [[CCVVEE--22001177--1122883377]] HHeeaapp bbuuffffeerr oovveerrffllooww iinn rreegguullaarr eexxpprreessssiioonn ccoommppiilleerr Compiling certain regular expression patterns with the case-insensitive modifier could cause a heap buffer overflow and crash perl. This has now been fixed. [GH #16021] https://github.com/Perl/perl5/issues/16021

[[CCVVEE--22001177--1122888833]] BBuuffffeerr oovveerr--rreeaadd iinn rreegguullaarr eexxpprreessssiioonn ppaarrsseerr For certain types of syntax error in a regular expression pattern, the error message could either contain the contents of a random, possibly large, chunk of memory, or could crash perl. This has now been fixed. [GH #16025] https://github.com/Perl/perl5/issues/16025

[[CCVVEE--22001177--1122881144]] $$EENNVV{{$$kkeeyy}} ssttaacckk bbuuffffeerr oovveerrffllooww oonn WWiinnddoowwss A possible stack buffer overflow in the %ENV code on Windows has been fixed by removing the buffer completely since it was superfluous anyway. [GH #16051] https://github.com/Perl/perl5/issues/16051

IInnccoommppaattiibbllee CChhaannggeess There are no changes intentionally incompatible with 5.24.2. 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 • Module::CoreList has been upgraded from version 5.20170715_24 to 5.20170922_24.

 •   POSIX has been upgraded from version 1.65 to 1.65_01.

 •   Time::HiRes has been upgraded from version 1.9733 to 1.9741.

     [GH #15396] <https://github.com/Perl/perl5/issues/15396> [GH #15401]
     <https://github.com/Perl/perl5/issues/15401> [GH #15524]
     <https://github.com/Perl/perl5/issues/15524> [cpan #120032]
     <https://rt.cpan.org/Public/Bug/Display.html?id=120032>

CCoonnffiigguurraattiioonn aanndd CCoommppiillaattiioonn • When building with GCC 6 and link-time optimization (the --ffllttoo option to ggcccc), _C_o_n_f_i_g_u_r_e was treating all probed symbols as present on the system, regardless of whether they actually exist. This has been fixed. [GH #15322] https://github.com/Perl/perl5/issues/15322

 •   _C_o_n_f_i_g_u_r_e now aborts if both "-Duselongdouble" and "-Dusequadmath"
     are requested.  [GH #14944]
     <https://github.com/Perl/perl5/issues/14944>

 •   Fixed a bug in which _C_o_n_f_i_g_u_r_e could append "-quadmath" to the
     archname even if it was already present.  [GH #15423]
     <https://github.com/Perl/perl5/issues/15423>

 •   Clang builds with "-DPERL_GLOBAL_STRUCT" or
     "-DPERL_GLOBAL_STRUCT_PRIVATE" have been fixed (by disabling Thread
     Safety Analysis for these configurations).

PPllaattffoorrmm SSuuppppoorrtt PPllaattffoorrmm--SSppeecciiffiicc NNootteess

VMS #

     •   "configure.com" now recognizes the VSI-branded C compiler.

 Windows
     •   Building XS modules with GCC 6 in a 64-bit build of Perl failed
         due to incorrect mapping of "strtoll" and "strtoull".  This has
         now been fixed.  [GH #16074]
         <https://github.com/Perl/perl5/issues/16074> [cpan #121683]
         <https://rt.cpan.org/Public/Bug/Display.html?id=121683> [cpan
         #122353] <https://rt.cpan.org/Public/Bug/Display.html?id=122353>

SSeelleecctteedd BBuugg FFiixxeess • “/@0{0*->@*/*0” and similar contortions used to crash, but no longer do, but merely produce a syntax error. [GH #15333] https://github.com/Perl/perl5/issues/15333

 •   "do" or "require" with an argument which is a reference or typeglob
     which, when stringified, contains a null character, started crashing
     in Perl 5.20, but has now been fixed.  [GH #15337]
     <https://github.com/Perl/perl5/issues/15337>

 •   Expressions containing an "&&" or "||" operator (or their synonyms
     "and" and "or") were being compiled incorrectly in some cases.  If
     the left-hand side consisted of either a negated bareword constant or
     a negated "do {}" block containing a constant expression, and the
     right-hand side consisted of a negated non-foldable expression, one
     of the negations was effectively ignored.  The same was true of "if"
     and "unless" statement modifiers, though with the left-hand and
     right-hand sides swapped.  This long-standing bug has now been fixed.
     [GH #15285] <https://github.com/Perl/perl5/issues/15285>

 •   "reset" with an argument no longer crashes when encountering stash
     entries other than globs.  [GH #15314]
     <https://github.com/Perl/perl5/issues/15314>

 •   Assignment of hashes to, and deletion of, typeglobs named *:::::: no
     longer causes crashes.  [GH #15307]
     <https://github.com/Perl/perl5/issues/15307>

 •   Assignment variants of any bitwise ops under the "bitwise" feature
     would crash if the left-hand side was an array or hash.  [GH #15346]
     <https://github.com/Perl/perl5/issues/15346>

 •   "socket" now leaves the error code returned by the system in $! on
     failure.  [GH #15383] <https://github.com/Perl/perl5/issues/15383>

 •   Parsing bad POSIX charclasses no longer leaks memory.  [GH #15382]
     <https://github.com/Perl/perl5/issues/15382>

 •   Since Perl 5.20, line numbers have been off by one when perl is
     invoked with the --xx switch.  This has been fixed.  [GH #15413]
     <https://github.com/Perl/perl5/issues/15413>

 •   Some obscure cases of subroutines and file handles being freed at the
     same time could result in crashes, but have been fixed.  The crash
     was introduced in Perl 5.22.  [GH #15435]
     <https://github.com/Perl/perl5/issues/15435>

 •   Some regular expression parsing glitches could lead to assertion
     failures with regular expressions such as "/(?<=/" and "/(?<!/".
     This has now been fixed.  [GH #15332]
     <https://github.com/Perl/perl5/issues/15332>

 •   "gethostent" and similar functions now perform a null check
     internally, to avoid crashing with the torsocks library.  This was a
     regression from Perl 5.22.  [GH #15478]
     <https://github.com/Perl/perl5/issues/15478>

 •   Mentioning the same constant twice in a row (which is a syntax error)
     no longer fails an assertion under debugging builds.  This was a
     regression from Perl 5.20.  [GH #15017]
     <https://github.com/Perl/perl5/issues/15017>

 •   In Perl 5.24 "fchown" was changed not to accept negative one as an
     argument because in some platforms that is an error.  However, in
     some other platforms that is an acceptable argument.  This change has
     been reverted.  [GH #15523]
     <https://github.com/Perl/perl5/issues/15523>.

 •   "@{x" followed by a newline where "x" represents a control or non-
     ASCII character no longer produces a garbled syntax error message or
     a crash.  [GH #15518] <https://github.com/Perl/perl5/issues/15518>

 •   A regression in Perl 5.24 with "tr/\N{U+...}/foo/" when the code
     point was between 128 and 255 has been fixed.  [GH #15475]
     <https://github.com/Perl/perl5/issues/15475>.

 •   Many issues relating to "printf "%a"" of hexadecimal floating point
     were fixed.  In addition, the "subnormals" (formerly known as
     "denormals") floating point numbers are now supported both with the
     plain IEEE 754 floating point numbers (64-bit or 128-bit) and the x86
     80-bit "extended precision".  Note that subnormal hexadecimal
     floating point literals will give a warning about "exponent
     underflow".  [GH #15495] <https://github.com/Perl/perl5/issues/15495>
     [GH #15502] <https://github.com/Perl/perl5/issues/15502> [GH #15503]
     <https://github.com/Perl/perl5/issues/15503> [GH #15504]
     <https://github.com/Perl/perl5/issues/15504> [GH #15505]
     <https://github.com/Perl/perl5/issues/15505> [GH #15510]
     <https://github.com/Perl/perl5/issues/15510> [GH #15512]
     <https://github.com/Perl/perl5/issues/15512>

 •   The parser could sometimes crash if a bareword came after
     "evalbytes".  [GH #15586]
     <https://github.com/Perl/perl5/issues/15586>

 •   Fixed a place where the regex parser was not setting the syntax error
     correctly on a syntactically incorrect pattern.  [GH #15565]
     <https://github.com/Perl/perl5/issues/15565>

 •   A vulnerability in Perl's "sprintf" implementation has been fixed by
     avoiding a possible memory wrap.  [GH #15970]
     <https://github.com/Perl/perl5/issues/15970>

AAcckknnoowwlleeddggeemmeennttss Perl 5.24.3 represents approximately 2 months of development since Perl 5.24.2 and contains approximately 3,200 lines of changes across 120 files from 23 authors.

 Excluding auto-generated files, documentation and release tools, there
 were approximately 1,600 lines of changes to 56 .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 5.24.3:

 Aaron Crane, Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Collins,
 Daniel Dragan, Dave Cross, David Mitchell, Eric Herman, Father
 Chrysostomos, H.Merijn Brand, Hugo van der Sanden, James E Keenan, Jarkko
 Hietaniemi, John SJ Anderson, Karl Williamson, Ken Brown, Lukas Mai,
 Matthew Horsfall, Stevan Little, Steve Hay, Steven Humphrey, Tony Cook,
 Yves Orton.

 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 PERL5243DELTA(1)