1PERL5125DELTA(1)       Perl Programmers Reference Guide       PERL5125DELTA(1)
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NAME

6       perl5125delta - what is new for perl v5.12.5
7

DESCRIPTION

9       This document describes differences between the 5.12.4 release and the
10       5.12.5 release.
11
12       If you are upgrading from an earlier release such as 5.12.3, first read
13       perl5124delta, which describes differences between 5.12.3 and 5.12.4.
14

Security

16   "Encode" decode_xs n-byte heap-overflow (CVE-2011-2939)
17       A bug in "Encode" could, on certain inputs, cause the heap to overflow.
18       This problem has been corrected.  Bug reported by Robert Zacek.
19
20   "File::Glob::bsd_glob()" memory error with GLOB_ALTDIRFUNC (CVE-2011-2728).
21       Calling "File::Glob::bsd_glob" with the unsupported flag
22       GLOB_ALTDIRFUNC would cause an access violation / segfault.  A Perl
23       program that accepts a flags value from an external source could expose
24       itself to denial of service or arbitrary code execution attacks.  There
25       are no known exploits in the wild.  The problem has been corrected by
26       explicitly disabling all unsupported flags and setting unused function
27       pointers to null.  Bug reported by Clement Lecigne.
28
29   Heap buffer overrun in 'x' string repeat operator (CVE-2012-5195)
30       Poorly written perl code that allows an attacker to specify the count
31       to perl's 'x' string repeat operator can already cause a memory
32       exhaustion denial-of-service attack. A flaw in versions of perl before
33       5.15.5 can escalate that into a heap buffer overrun; coupled with
34       versions of glibc before 2.16, it possibly allows the execution of
35       arbitrary code.
36
37       This problem has been fixed.
38

Incompatible Changes

40       There are no changes intentionally incompatible with 5.12.4. If any
41       exist, they are bugs and reports are welcome.
42

Modules and Pragmata

44   Updated Modules
45       B::Concise
46
47       B::Concise no longer produces mangled output with the -tree option
48       [perl #80632].
49
50       charnames
51
52       A regression introduced in Perl 5.8.8 has been fixed, that caused
53       charnames::viacode(0) to return "undef" instead of the string "NULL"
54       [perl #72624].
55
56       Encode has been upgraded from version 2.39 to version 2.39_01.
57
58       See "Security".
59
60       File::Glob has been upgraded from version 1.07 to version 1.07_01.
61
62       See "Security".
63
64       Unicode::UCD
65
66       The documentation for the "upper" function now actually says "upper",
67       not "lower".
68
69       Module::CoreList
70
71       Module::CoreList has been updated to version 2.50_02 to add data for
72       this release.
73

Changes to Existing Documentation

75   perlebcdic
76       The perlebcdic document contains a helpful table to use in "tr///" to
77       convert between EBCDIC and Latin1/ASCII.  Unfortunately, the table was
78       the inverse of the one it describes.  This has been corrected.
79
80   perlunicode
81       The section on User-Defined Case Mappings had some bad markup and
82       unclear sentences, making parts of it unreadable.  This has been
83       rectified.
84
85   perluniprops
86       This document has been corrected to take non-ASCII platforms into
87       account.
88

Installation and Configuration Improvements

90   Platform Specific Changes
91       Mac OS X
92           There have been configuration and test fixes to make Perl build
93           cleanly on Lion and Mountain Lion.
94
95       NetBSD
96           The NetBSD hints file was corrected to be compatible with NetBSD
97           6.*
98

Selected Bug Fixes

100       •   "chop" now correctly handles characters above "\x{7fffffff}" [perl
101           #73246].
102
103       •   "($<,$>) = (...)" stopped working properly in 5.12.0.  It is
104           supposed to make a single "setreuid()" call, rather than calling
105           "setruid()" and "seteuid()" separately.  Consequently it did not
106           work properly.  This has been fixed [perl #75212].
107
108       •   Fixed a regression of kill() when a match variable is used for the
109           process ID to kill [perl #75812].
110
111       •   "UNIVERSAL::VERSION" no longer leaks memory.  It started leaking in
112           Perl 5.10.0.
113
114       •   The C-level "my_strftime" functions no longer leaks memory.  This
115           fixes a memory leak in "POSIX::strftime" [perl #73520].
116
117       •   "caller" no longer leaks memory when called from the DB package if
118           @DB::args was assigned to after the first call to "caller".  Carp
119           was triggering this bug [perl #97010].
120
121       •   Passing to "index" an offset beyond the end of the string when the
122           string is encoded internally in UTF8 no longer causes panics [perl
123           #75898].
124
125       •   Syntax errors in "(?{...})" blocks in regular expressions no longer
126           cause panic messages [perl #2353].
127
128       •   Perl 5.10.0 introduced some faulty logic that made "U*" in the
129           middle of a pack template equivalent to "U0" if the input string
130           was empty.  This has been fixed [perl #90160].
131

Errata

133   split() and @_
134       split() no longer modifies @_ when called in scalar or void context.
135       In void context it now produces a "Useless use of split" warning.  This
136       is actually a change introduced in perl 5.12.0, but it was missed from
137       that release's perl5120delta.
138

Acknowledgements

140       Perl 5.12.5 represents approximately 17 months of development since
141       Perl 5.12.4 and contains approximately 1,900 lines of changes across 64
142       files from 18 authors.
143
144       Perl continues to flourish into its third decade thanks to a vibrant
145       community of users and developers. The following people are known to
146       have contributed the improvements that became Perl 5.12.5:
147
148       Andy Dougherty, Chris 'BinGOs' Williams, Craig A. Berry, David
149       Mitchell, Dominic Hargreaves, Father Chrysostomos, Florian Ragwitz,
150       George Greer, Goro Fuji, Jesse Vincent, Karl Williamson, Leon Brocard,
151       Nicholas Clark, Rafael Garcia-Suarez, Reini Urban, Ricardo Signes,
152       Steve Hay, Tony Cook.
153
154       The list above is almost certainly incomplete as it is automatically
155       generated from version control history. In particular, it does not
156       include the names of the (very much appreciated) contributors who
157       reported issues to the Perl bug tracker.
158
159       Many of the changes included in this version originated in the CPAN
160       modules included in Perl's core. We're grateful to the entire CPAN
161       community for helping Perl to flourish.
162
163       For a more complete list of all of Perl's historical contributors,
164       please see the AUTHORS file in the Perl source distribution.
165

Reporting Bugs

167       If you find what you think is a bug, you might check the articles
168       recently posted to the comp.lang.perl.misc newsgroup and the perl bug
169       database at http://rt.perl.org/perlbug/ .  There may also be
170       information at http://www.perl.org/ , the Perl Home Page.
171
172       If you believe you have an unreported bug, please run the perlbug
173       program included with your release.  Be sure to trim your bug down to a
174       tiny but sufficient test case.  Your bug report, along with the output
175       of "perl -V", will be sent off to perlbug@perl.org to be analysed by
176       the Perl porting team.
177
178       If the bug you are reporting has security implications, which make it
179       inappropriate to send to a publicly archived mailing list, then please
180       send it to perl5-security-report@perl.org. This points to a closed
181       subscription unarchived mailing list, which includes all the core
182       committers, who be able to help assess the impact of issues, figure out
183       a resolution, and help co-ordinate the release of patches to mitigate
184       or fix the problem across all platforms on which Perl is supported.
185       Please only use this address for security issues in the Perl core, not
186       for modules independently distributed on CPAN.
187

SEE ALSO

189       The Changes file for an explanation of how to view exhaustive details
190       on what changed.
191
192       The INSTALL file for how to build Perl.
193
194       The README file for general stuff.
195
196       The Artistic and Copying files for copyright information.
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200perl v5.36.0                      2022-08-30                  PERL5125DELTA(1)
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