1PERL5261DELTA(1) Perl Programmers Reference Guide PERL5261DELTA(1)
2
6 perl5261delta - what is new for perl v5.26.1
7
9 This document describes differences between the 5.26.0 release and the
10 5.26.1 release.
11 If you are upgrading from an earlier release such as 5.24.0, first read
13 perl5260delta, which describes differences between 5.24.0 and 5.26.0.
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 5.26.0. 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 · base has been upgraded from version 2.25 to 2.26.
42 The effects of dotless @INC on this module have been limited by the
44 introduction of a more refined and accurate solution for removing
45 '.' from @INC while reducing the false positives.
46 · charnames has been upgraded from version 1.44 to 1.45.
48 · Module::CoreList has been upgraded from version 5.20170530 to
50 5.20170922_26.
51
53 Platform-Specific Notes
54 FreeBSD
55 · Building with g++ on FreeBSD-11.0 has been fixed. [perl
56 #131337]
57 <https://rt.perl.org/Public/Bug/Display.html?id=131337>
58 Windows
60 · Support for compiling perl on Windows using Microsoft Visual
61 Studio 2017 (containing Visual C++ 14.1) has been added.
62 · Building XS modules with GCC 6 in a 64-bit build of Perl failed
64 due to incorrect mapping of "strtoll" and "strtoull". This has
65 now been fixed. [perl #131726]
66 <https://rt.perl.org/Public/Bug/Display.html?id=131726> [cpan
67 #121683]
68 <https://rt.cpan.org/Public/Bug/Display.html?id=121683> [cpan
69 #122353]
70 <https://rt.cpan.org/Public/Bug/Display.html?id=122353>
71
73 · Several built-in functions previously had bugs that could cause
74 them to write to the internal stack without allocating room for the
75 item being written. In rare situations, this could have led to a
76 crash. These bugs have now been fixed, and if any similar bugs are
77 introduced in future, they will be detected automatically in
78 debugging builds. [perl #131732]
79 <https://rt.perl.org/Public/Bug/Display.html?id=131732>
80 · Using a symbolic ref with postderef syntax as the key in a hash
82 lookup was yielding an assertion failure on debugging builds.
83 [perl #131627]
84 <https://rt.perl.org/Public/Bug/Display.html?id=131627>
85 · List assignment ("aassign") could in some rare cases allocate an
87 entry on the mortal stack and leave the entry uninitialized. [perl
88 #131570] <https://rt.perl.org/Public/Bug/Display.html?id=131570>
89 · Attempting to apply an attribute to an "our" variable where a
91 function of that name already exists could result in a NULL pointer
92 being supplied where an SV was expected, crashing perl. [perl
93 #131597] <https://rt.perl.org/Public/Bug/Display.html?id=131597>
94 · The code that vivifies a typeglob out of a code ref made some false
96 assumptions that could lead to a crash in cases such as $::{"A"} =
97 sub {}; \&{"A"}. This has now been fixed. [perl #131085]
98 <https://rt.perl.org/Public/Bug/Display.html?id=131085>
99 · "my_atof2" no longer reads beyond the terminating NUL, which
101 previously occurred if the decimal point is immediately before the
102 NUL. [perl #131526]
103 <https://rt.perl.org/Public/Bug/Display.html?id=131526>
104 · Occasional "Malformed UTF-8 character" crashes in "s//" on utf8
106 strings have been fixed. [perl #131575]
107 <https://rt.perl.org/Public/Bug/Display.html?id=131575>
108 · "perldoc -f s" now finds "s///". [perl #131371]
110 <https://rt.perl.org/Public/Bug/Display.html?id=131371>
111 · Some erroneous warnings after utf8 conversion have been fixed.
113 [perl #131190]
114 <https://rt.perl.org/Public/Bug/Display.html?id=131190>
115 · The "jmpenv" frame to catch Perl exceptions is set up lazily, and
117 this used to be a bit too lazy. The catcher is now set up earlier,
118 preventing some possible crashes. [perl #105930]
119 <https://rt.perl.org/Public/Bug/Display.html?id=105930>
120 · Spurious "Assuming NOT a POSIX class" warnings have been removed.
122 [perl #131522]
123 <https://rt.perl.org/Public/Bug/Display.html?id=131522>
124
126 Perl 5.26.1 represents approximately 4 months of development since Perl
127 5.26.0 and contains approximately 8,900 lines of changes across 85
128 files from 23 authors.
129 Excluding auto-generated files, documentation and release tools, there
131 were approximately 990 lines of changes to 38 .pm, .t, .c and .h files.
132 Perl continues to flourish into its third decade thanks to a vibrant
134 community of users and developers. The following people are known to
135 have contributed the improvements that became Perl 5.26.1:
136 Aaron Crane, Andy Dougherty, Aristotle Pagaltzis, Chris 'BinGOs'
138 Williams, Craig A. Berry, Dagfinn Ilmari Mannsaaker, David Mitchell, E.
139 Choroba, Eric Herman, Father Chrysostomos, Jacques Germishuys, James E
140 Keenan, John SJ Anderson, Karl Williamson, Ken Brown, Lukas Mai,
141 Matthew Horsfall, Ricardo Signes, Sawyer X, Steve Hay, Tony Cook, Yves
142 Orton, Zefram.
143 The list above is almost certainly incomplete as it is automatically
145 generated from version control history. In particular, it does not
146 include the names of the (very much appreciated) contributors who
147 reported issues to the Perl bug tracker.
148 Many of the changes included in this version originated in the CPAN
150 modules included in Perl's core. We're grateful to the entire CPAN
151 community for helping Perl to flourish.
152 For a more complete list of all of Perl's historical contributors,
154 please see the AUTHORS file in the Perl source distribution.
155
157 If you find what you think is a bug, you might check the perl bug
158 database at <https://rt.perl.org/> . There may also be information at
159 <http://www.perl.org/> , the Perl Home Page.
160 If you believe you have an unreported bug, please run the perlbug
162 program included with your release. Be sure to trim your bug down to a
163 tiny but sufficient test case. Your bug report, along with the output
164 of "perl -V", will be sent off to perlbug@perl.org to be analysed by
165 the Perl porting team.
166 If the bug you are reporting has security implications which make it
168 inappropriate to send to a publicly archived mailing list, then see
169 "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of
170 how to report the issue.
171
173 If you wish to thank the Perl 5 Porters for the work we had done in
174 Perl 5, you can do so by running the "perlthanks" program:
175 perlthanks
177 This will send an email to the Perl 5 Porters list with your show of
179 thanks.
180
182 The Changes file for an explanation of how to view exhaustive details
183 on what changed.
184 The INSTALL file for how to build Perl.
186 The README file for general stuff.
188 The Artistic and Copying files for copyright information.
190perl v5.26.3 2018-03-23 PERL5261DELTA(1)