1PERL5243DELTA(1) Perl Programmers Reference Guide PERL5243DELTA(1)
2
6 perl5243delta - what is new for perl v5.24.3
7
9 This document describes differences between the 5.24.2 release and the
10 5.24.3 release.
11 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
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. [perl #131582]
20 <https://rt.perl.org/Public/Bug/Display.html?id=131582>
21 [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 [perl #131598] <https://rt.perl.org/Public/Bug/Display.html?id=131598>
27 [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. [perl #131665]
32 <https://rt.perl.org/Public/Bug/Display.html?id=131665>
33
35 There are no changes intentionally incompatible with 5.24.2. If any
36 exist, they are bugs, and we request that you submit a report. See
37 "Reporting Bugs" below.
38
40 Updated Modules and Pragmata
41 · Module::CoreList has been upgraded from version 5.20170715_24 to
42 5.20170922_24.
43 · POSIX has been upgraded from version 1.65 to 1.65_01.
45 · Time::HiRes has been upgraded from version 1.9733 to 1.9741.
47 [perl #128427]
49 <https://rt.perl.org/Public/Bug/Display.html?id=128427> [perl
50 #128445] <https://rt.perl.org/Public/Bug/Display.html?id=128445>
51 [perl #128972]
52 <https://rt.perl.org/Public/Bug/Display.html?id=128972> [cpan
53 #120032] <https://rt.cpan.org/Public/Bug/Display.html?id=120032>
54
56 · When building with GCC 6 and link-time optimization (the -flto
57 option to gcc), Configure was treating all probed symbols as
58 present on the system, regardless of whether they actually exist.
59 This has been fixed. [perl #128131]
60 <https://rt.perl.org/Public/Bug/Display.html?id=128131>
61 · Configure now aborts if both "-Duselongdouble" and "-Dusequadmath"
63 are requested. [perl #126203]
64 <https://rt.perl.org/Public/Bug/Display.html?id=126203>
65 · Fixed a bug in which Configure could append "-quadmath" to the
67 archname even if it was already present. [perl #128538]
68 <https://rt.perl.org/Public/Bug/Display.html?id=128538>
69 · Clang builds with "-DPERL_GLOBAL_STRUCT" or
71 "-DPERL_GLOBAL_STRUCT_PRIVATE" have been fixed (by disabling Thread
72 Safety Analysis for these configurations).
73
75 Platform-Specific Notes
76 VMS
77 · "configure.com" now recognizes the VSI-branded C compiler.
78 Windows
80 · Building XS modules with GCC 6 in a 64-bit build of Perl failed
81 due to incorrect mapping of "strtoll" and "strtoull". This has
82 now been fixed. [perl #131726]
83 <https://rt.perl.org/Public/Bug/Display.html?id=131726> [cpan
84 #121683]
85 <https://rt.cpan.org/Public/Bug/Display.html?id=121683> [cpan
86 #122353]
87 <https://rt.cpan.org/Public/Bug/Display.html?id=122353>
88
90 · "/@0{0*->@*/*0" and similar contortions used to crash, but no
91 longer do, but merely produce a syntax error. [perl #128171]
92 <https://rt.perl.org/Public/Bug/Display.html?id=128171>
93 · "do" or "require" with an argument which is a reference or typeglob
95 which, when stringified, contains a null character, started
96 crashing in Perl 5.20, but has now been fixed. [perl #128182]
97 <https://rt.perl.org/Public/Bug/Display.html?id=128182>
98 · Expressions containing an "&&" or "||" operator (or their synonyms
100 "and" and "or") were being compiled incorrectly in some cases. If
101 the left-hand side consisted of either a negated bareword constant
102 or a negated "do {}" block containing a constant expression, and
103 the right-hand side consisted of a negated non-foldable expression,
104 one of the negations was effectively ignored. The same was true of
105 "if" and "unless" statement modifiers, though with the left-hand
106 and right-hand sides swapped. This long-standing bug has now been
107 fixed. [perl #127952]
108 <https://rt.perl.org/Public/Bug/Display.html?id=127952>
109 · "reset" with an argument no longer crashes when encountering stash
111 entries other than globs. [perl #128106]
112 <https://rt.perl.org/Public/Bug/Display.html?id=128106>
113 · Assignment of hashes to, and deletion of, typeglobs named *::::::
115 no longer causes crashes. [perl #128086]
116 <https://rt.perl.org/Public/Bug/Display.html?id=128086>
117 · Assignment variants of any bitwise ops under the "bitwise" feature
119 would crash if the left-hand side was an array or hash. [perl
120 #128204] <https://rt.perl.org/Public/Bug/Display.html?id=128204>
121 · "socket" now leaves the error code returned by the system in $! on
123 failure. [perl #128316]
124 <https://rt.perl.org/Public/Bug/Display.html?id=128316>
125 · Parsing bad POSIX charclasses no longer leaks memory. [perl
127 #128313] <https://rt.perl.org/Public/Bug/Display.html?id=128313>
128 · Since Perl 5.20, line numbers have been off by one when perl is
130 invoked with the -x switch. This has been fixed. [perl #128508]
131 <https://rt.perl.org/Public/Bug/Display.html?id=128508>
132 · Some obscure cases of subroutines and file handles being freed at
134 the same time could result in crashes, but have been fixed. The
135 crash was introduced in Perl 5.22. [perl #128597]
136 <https://rt.perl.org/Public/Bug/Display.html?id=128597>
137 · Some regular expression parsing glitches could lead to assertion
139 failures with regular expressions such as "/(?<=/" and "/(?<!/".
140 This has now been fixed. [perl #128170]
141 <https://rt.perl.org/Public/Bug/Display.html?id=128170>
142 · "gethostent" and similar functions now perform a null check
144 internally, to avoid crashing with the torsocks library. This was
145 a regression from Perl 5.22. [perl #128740]
146 <https://rt.perl.org/Public/Bug/Display.html?id=128740>
147 · Mentioning the same constant twice in a row (which is a syntax
149 error) no longer fails an assertion under debugging builds. This
150 was a regression from Perl 5.20. [perl #126482]
151 <https://rt.perl.org/Public/Bug/Display.html?id=126482>
152 · In Perl 5.24 "fchown" was changed not to accept negative one as an
154 argument because in some platforms that is an error. However, in
155 some other platforms that is an acceptable argument. This change
156 has been reverted. [perl #128967]
157 <https://rt.perl.org/Public/Bug/Display.html?id=128967>.
158 · "@{x" followed by a newline where "x" represents a control or non-
160 ASCII character no longer produces a garbled syntax error message
161 or a crash. [perl #128951]
162 <https://rt.perl.org/Public/Bug/Display.html?id=128951>
163 · A regression in Perl 5.24 with "tr/\N{U+...}/foo/" when the code
165 point was between 128 and 255 has been fixed. [perl #128734]
166 <https://rt.perl.org/Public/Bug/Display.html?id=128734>.
167 · Many issues relating to "printf "%a"" of hexadecimal floating point
169 were fixed. In addition, the "subnormals" (formerly known as
170 "denormals") floating point numbers are now supported both with the
171 plain IEEE 754 floating point numbers (64-bit or 128-bit) and the
172 x86 80-bit "extended precision". Note that subnormal hexadecimal
173 floating point literals will give a warning about "exponent
174 underflow". [perl #128843]
175 <https://rt.perl.org/Public/Bug/Display.html?id=128843> [perl
176 #128888] <https://rt.perl.org/Public/Bug/Display.html?id=128888>
177 [perl #128889]
178 <https://rt.perl.org/Public/Bug/Display.html?id=128889> [perl
179 #128890] <https://rt.perl.org/Public/Bug/Display.html?id=128890>
180 [perl #128893]
181 <https://rt.perl.org/Public/Bug/Display.html?id=128893> [perl
182 #128909] <https://rt.perl.org/Public/Bug/Display.html?id=128909>
183 [perl #128919]
184 <https://rt.perl.org/Public/Bug/Display.html?id=128919>
185 · The parser could sometimes crash if a bareword came after
187 "evalbytes". [perl #129196]
188 <https://rt.perl.org/Public/Bug/Display.html?id=129196>
189 · Fixed a place where the regex parser was not setting the syntax
191 error correctly on a syntactically incorrect pattern. [perl
192 #129122] <https://rt.perl.org/Public/Bug/Display.html?id=129122>
193 · A vulnerability in Perl's "sprintf" implementation has been fixed
195 by avoiding a possible memory wrap. [perl #131260]
196 <https://rt.perl.org/Public/Bug/Display.html?id=131260>
197
199 Perl 5.24.3 represents approximately 2 months of development since Perl
200 5.24.2 and contains approximately 3,200 lines of changes across 120
201 files from 23 authors.
202 Excluding auto-generated files, documentation and release tools, there
204 were approximately 1,600 lines of changes to 56 .pm, .t, .c and .h
205 files.
206 Perl continues to flourish into its third decade thanks to a vibrant
208 community of users and developers. The following people are known to
209 have contributed the improvements that became Perl 5.24.3:
210 Aaron Crane, Craig A. Berry, Dagfinn Ilmari Mannsaaker, Dan Collins,
212 Daniel Dragan, Dave Cross, David Mitchell, Eric Herman, Father
213 Chrysostomos, H.Merijn Brand, Hugo van der Sanden, James E Keenan,
214 Jarkko Hietaniemi, John SJ Anderson, Karl Williamson, Ken Brown, Lukas
215 Mai, Matthew Horsfall, Stevan Little, Steve Hay, Steven Humphrey, Tony
216 Cook, Yves Orton.
217 The list above is almost certainly incomplete as it is automatically
219 generated from version control history. In particular, it does not
220 include the names of the (very much appreciated) contributors who
221 reported issues to the Perl bug tracker.
222 Many of the changes included in this version originated in the CPAN
224 modules included in Perl's core. We're grateful to the entire CPAN
225 community for helping Perl to flourish.
226 For a more complete list of all of Perl's historical contributors,
228 please see the AUTHORS file in the Perl source distribution.
229
231 If you find what you think is a bug, you might check the articles
232 recently posted to the comp.lang.perl.misc newsgroup and the perl bug
233 database at <https://rt.perl.org/> . There may also be information at
234 <http://www.perl.org/> , the Perl Home Page.
235 If you believe you have an unreported bug, please run the perlbug
237 program included with your release. Be sure to trim your bug down to a
238 tiny but sufficient test case. Your bug report, along with the output
239 of "perl -V", will be sent off to perlbug@perl.org to be analysed by
240 the Perl porting team.
241 If the bug you are reporting has security implications which make it
243 inappropriate to send to a publicly archived mailing list, then see
244 "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of
245 how to report the issue.
246
248 The Changes file for an explanation of how to view exhaustive details
249 on what changed.
250 The INSTALL file for how to build Perl.
252 The README file for general stuff.
254 The Artistic and Copying files for copyright information.
256perl v5.32.1 2021-03-31 PERL5243DELTA(1)