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

6       perl5243delta - what is new for perl v5.24.3
7

DESCRIPTION

9       This document describes differences between the 5.24.2 release and the
10       5.24.3 release.
11
12       If you are upgrading from an earlier release such as 5.24.1, first read
13       perl5242delta, which describes differences between 5.24.1 and 5.24.2.
14

Security

16   [CVE-2017-12837] Heap buffer overflow in regular expression compiler
17       Compiling certain regular expression patterns with the case-insensitive
18       modifier could cause a heap buffer overflow and crash perl.  This has
19       now been fixed.  [GH #16021]
20       <https://github.com/Perl/perl5/issues/16021>
21
22   [CVE-2017-12883] Buffer over-read in regular expression parser
23       For certain types of syntax error in a regular expression pattern, the
24       error message could either contain the contents of a random, possibly
25       large, chunk of memory, or could crash perl.  This has now been fixed.
26       [GH #16025] <https://github.com/Perl/perl5/issues/16025>
27
28   [CVE-2017-12814] $ENV{$key} stack buffer overflow on Windows
29       A possible stack buffer overflow in the %ENV code on Windows has been
30       fixed by removing the buffer completely since it was superfluous
31       anyway.  [GH #16051] <https://github.com/Perl/perl5/issues/16051>
32

Incompatible Changes

34       There are no changes intentionally incompatible with 5.24.2.  If any
35       exist, they are bugs, and we request that you submit a report.  See
36       "Reporting Bugs" below.
37

Modules and Pragmata

39   Updated Modules and Pragmata
40       •   Module::CoreList has been upgraded from version 5.20170715_24 to
41           5.20170922_24.
42
43       •   POSIX has been upgraded from version 1.65 to 1.65_01.
44
45       •   Time::HiRes has been upgraded from version 1.9733 to 1.9741.
46
47           [GH #15396] <https://github.com/Perl/perl5/issues/15396> [GH
48           #15401] <https://github.com/Perl/perl5/issues/15401> [GH #15524]
49           <https://github.com/Perl/perl5/issues/15524> [cpan #120032]
50           <https://rt.cpan.org/Public/Bug/Display.html?id=120032>
51

Configuration and Compilation

53       •   When building with GCC 6 and link-time optimization (the -flto
54           option to gcc), Configure was treating all probed symbols as
55           present on the system, regardless of whether they actually exist.
56           This has been fixed.  [GH #15322]
57           <https://github.com/Perl/perl5/issues/15322>
58
59Configure now aborts if both "-Duselongdouble" and "-Dusequadmath"
60           are requested.  [GH #14944]
61           <https://github.com/Perl/perl5/issues/14944>
62
63       •   Fixed a bug in which Configure could append "-quadmath" to the
64           archname even if it was already present.  [GH #15423]
65           <https://github.com/Perl/perl5/issues/15423>
66
67       •   Clang builds with "-DPERL_GLOBAL_STRUCT" or
68           "-DPERL_GLOBAL_STRUCT_PRIVATE" have been fixed (by disabling Thread
69           Safety Analysis for these configurations).
70

Platform Support

72   Platform-Specific Notes
73       VMS
74           •   "configure.com" now recognizes the VSI-branded C compiler.
75
76       Windows
77           •   Building XS modules with GCC 6 in a 64-bit build of Perl failed
78               due to incorrect mapping of "strtoll" and "strtoull".  This has
79               now been fixed.  [GH #16074]
80               <https://github.com/Perl/perl5/issues/16074> [cpan #121683]
81               <https://rt.cpan.org/Public/Bug/Display.html?id=121683> [cpan
82               #122353]
83               <https://rt.cpan.org/Public/Bug/Display.html?id=122353>
84

Selected Bug Fixes

86       •   "/@0{0*->@*/*0" and similar contortions used to crash, but no
87           longer do, but merely produce a syntax error.  [GH #15333]
88           <https://github.com/Perl/perl5/issues/15333>
89
90       •   "do" or "require" with an argument which is a reference or typeglob
91           which, when stringified, contains a null character, started
92           crashing in Perl 5.20, but has now been fixed.  [GH #15337]
93           <https://github.com/Perl/perl5/issues/15337>
94
95       •   Expressions containing an "&&" or "||" operator (or their synonyms
96           "and" and "or") were being compiled incorrectly in some cases.  If
97           the left-hand side consisted of either a negated bareword constant
98           or a negated "do {}" block containing a constant expression, and
99           the right-hand side consisted of a negated non-foldable expression,
100           one of the negations was effectively ignored.  The same was true of
101           "if" and "unless" statement modifiers, though with the left-hand
102           and right-hand sides swapped.  This long-standing bug has now been
103           fixed.  [GH #15285] <https://github.com/Perl/perl5/issues/15285>
104
105       •   "reset" with an argument no longer crashes when encountering stash
106           entries other than globs.  [GH #15314]
107           <https://github.com/Perl/perl5/issues/15314>
108
109       •   Assignment of hashes to, and deletion of, typeglobs named *::::::
110           no longer causes crashes.  [GH #15307]
111           <https://github.com/Perl/perl5/issues/15307>
112
113       •   Assignment variants of any bitwise ops under the "bitwise" feature
114           would crash if the left-hand side was an array or hash.  [GH
115           #15346] <https://github.com/Perl/perl5/issues/15346>
116
117       •   "socket" now leaves the error code returned by the system in $! on
118           failure.  [GH #15383] <https://github.com/Perl/perl5/issues/15383>
119
120       •   Parsing bad POSIX charclasses no longer leaks memory.  [GH #15382]
121           <https://github.com/Perl/perl5/issues/15382>
122
123       •   Since Perl 5.20, line numbers have been off by one when perl is
124           invoked with the -x switch.  This has been fixed.  [GH #15413]
125           <https://github.com/Perl/perl5/issues/15413>
126
127       •   Some obscure cases of subroutines and file handles being freed at
128           the same time could result in crashes, but have been fixed.  The
129           crash was introduced in Perl 5.22.  [GH #15435]
130           <https://github.com/Perl/perl5/issues/15435>
131
132       •   Some regular expression parsing glitches could lead to assertion
133           failures with regular expressions such as "/(?<=/" and "/(?<!/".
134           This has now been fixed.  [GH #15332]
135           <https://github.com/Perl/perl5/issues/15332>
136
137       •   "gethostent" and similar functions now perform a null check
138           internally, to avoid crashing with the torsocks library.  This was
139           a regression from Perl 5.22.  [GH #15478]
140           <https://github.com/Perl/perl5/issues/15478>
141
142       •   Mentioning the same constant twice in a row (which is a syntax
143           error) no longer fails an assertion under debugging builds.  This
144           was a regression from Perl 5.20.  [GH #15017]
145           <https://github.com/Perl/perl5/issues/15017>
146
147       •   In Perl 5.24 "fchown" was changed not to accept negative one as an
148           argument because in some platforms that is an error.  However, in
149           some other platforms that is an acceptable argument.  This change
150           has been reverted.  [GH #15523]
151           <https://github.com/Perl/perl5/issues/15523>.
152
153       •   "@{x" followed by a newline where "x" represents a control or non-
154           ASCII character no longer produces a garbled syntax error message
155           or a crash.  [GH #15518]
156           <https://github.com/Perl/perl5/issues/15518>
157
158       •   A regression in Perl 5.24 with "tr/\N{U+...}/foo/" when the code
159           point was between 128 and 255 has been fixed.  [GH #15475]
160           <https://github.com/Perl/perl5/issues/15475>.
161
162       •   Many issues relating to "printf "%a"" of hexadecimal floating point
163           were fixed.  In addition, the "subnormals" (formerly known as
164           "denormals") floating point numbers are now supported both with the
165           plain IEEE 754 floating point numbers (64-bit or 128-bit) and the
166           x86 80-bit "extended precision".  Note that subnormal hexadecimal
167           floating point literals will give a warning about "exponent
168           underflow".  [GH #15495]
169           <https://github.com/Perl/perl5/issues/15495> [GH #15502]
170           <https://github.com/Perl/perl5/issues/15502> [GH #15503]
171           <https://github.com/Perl/perl5/issues/15503> [GH #15504]
172           <https://github.com/Perl/perl5/issues/15504> [GH #15505]
173           <https://github.com/Perl/perl5/issues/15505> [GH #15510]
174           <https://github.com/Perl/perl5/issues/15510> [GH #15512]
175           <https://github.com/Perl/perl5/issues/15512>
176
177       •   The parser could sometimes crash if a bareword came after
178           "evalbytes".  [GH #15586]
179           <https://github.com/Perl/perl5/issues/15586>
180
181       •   Fixed a place where the regex parser was not setting the syntax
182           error correctly on a syntactically incorrect pattern.  [GH #15565]
183           <https://github.com/Perl/perl5/issues/15565>
184
185       •   A vulnerability in Perl's "sprintf" implementation has been fixed
186           by avoiding a possible memory wrap.  [GH #15970]
187           <https://github.com/Perl/perl5/issues/15970>
188

Acknowledgements

190       Perl 5.24.3 represents approximately 2 months of development since Perl
191       5.24.2 and contains approximately 3,200 lines of changes across 120
192       files from 23 authors.
193
194       Excluding auto-generated files, documentation and release tools, there
195       were approximately 1,600 lines of changes to 56 .pm, .t, .c and .h
196       files.
197
198       Perl continues to flourish into its third decade thanks to a vibrant
199       community of users and developers.  The following people are known to
200       have contributed the improvements that became Perl 5.24.3:
201
202       Aaron Crane, Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Collins,
203       Daniel Dragan, Dave Cross, David Mitchell, Eric Herman, Father
204       Chrysostomos, H.Merijn Brand, Hugo van der Sanden, James E Keenan,
205       Jarkko Hietaniemi, John SJ Anderson, Karl Williamson, Ken Brown, Lukas
206       Mai, Matthew Horsfall, Stevan Little, Steve Hay, Steven Humphrey, Tony
207       Cook, Yves Orton.
208
209       The list above is almost certainly incomplete as it is automatically
210       generated from version control history.  In particular, it does not
211       include the names of the (very much appreciated) contributors who
212       reported issues to the Perl bug tracker.
213
214       Many of the changes included in this version originated in the CPAN
215       modules included in Perl's core.  We're grateful to the entire CPAN
216       community for helping Perl to flourish.
217
218       For a more complete list of all of Perl's historical contributors,
219       please see the AUTHORS file in the Perl source distribution.
220

Reporting Bugs

222       If you find what you think is a bug, you might check the articles
223       recently posted to the comp.lang.perl.misc newsgroup and the perl bug
224       database at <https://rt.perl.org/> .  There may also be information at
225       <http://www.perl.org/> , the Perl Home Page.
226
227       If you believe you have an unreported bug, please run the perlbug
228       program included with your release.  Be sure to trim your bug down to a
229       tiny but sufficient test case.  Your bug report, along with the output
230       of "perl -V", will be sent off to perlbug@perl.org to be analysed by
231       the Perl porting team.
232
233       If the bug you are reporting has security implications which make it
234       inappropriate to send to a publicly archived mailing list, then see
235       "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of
236       how to report the issue.
237

SEE ALSO

239       The Changes file for an explanation of how to view exhaustive details
240       on what changed.
241
242       The INSTALL file for how to build Perl.
243
244       The README file for general stuff.
245
246       The Artistic and Copying files for copyright information.
247
248
249
250perl v5.38.2                      2023-11-30                  PERL5243DELTA(1)
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