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




NAME

       perldelta - what is new for perl v5.24.3


DESCRIPTION

       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.


Security

   [CVE-2017-12837] Heap buffer overflow in regular expression compiler
       Compiling certain regular expression patterns with the case-insensitive
       modifier could cause a heap buffer overflow and crash perl.  This has
       now been fixed.  [perl #131582]
       <https://rt.perl.org/Public/Bug/Display.html?id=131582>

   [CVE-2017-12883] Buffer over-read in regular expression parser
       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.
       [perl #131598] <https://rt.perl.org/Public/Bug/Display.html?id=131598>

   [CVE-2017-12814] $ENV{$key} stack buffer overflow on Windows
       A possible stack buffer overflow in the %ENV code on Windows has been
       fixed by removing the buffer completely since it was superfluous
       anyway.  [perl #131665]
       <https://rt.perl.org/Public/Bug/Display.html?id=131665>


Incompatible Changes

       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.


Modules and Pragmata

   Updated Modules and Pragmata
       o   Module::CoreList has been upgraded from version 5.20170715_24 to
           5.20170922_24.

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

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

           [perl #128427]
           <https://rt.perl.org/Public/Bug/Display.html?id=128427> [perl
           #128445] <https://rt.perl.org/Public/Bug/Display.html?id=128445>
           [perl #128972]
           <https://rt.perl.org/Public/Bug/Display.html?id=128972> [cpan
           #120032] <https://rt.cpan.org/Public/Bug/Display.html?id=120032>


Configuration and Compilation

       o   When building with GCC 6 and link-time optimization (the -flto
           option to gcc), Configure was treating all probed symbols as
           present on the system, regardless of whether they actually exist.
           This has been fixed.  [perl #128131]
           <https://rt.perl.org/Public/Bug/Display.html?id=128131>

       o   Configure now aborts if both "-Duselongdouble" and "-Dusequadmath"
           are requested.  [perl #126203]
           <https://rt.perl.org/Public/Bug/Display.html?id=126203>

       o   Fixed a bug in which Configure could append "-quadmath" to the
           archname even if it was already present.  [perl #128538]
           <https://rt.perl.org/Public/Bug/Display.html?id=128538>

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


Platform Support

   Platform-Specific Notes
       VMS
           o   "configure.com" now recognizes the VSI-branded C compiler.

       Windows
           o   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.  [perl #131726]
               <https://rt.perl.org/Public/Bug/Display.html?id=131726> [cpan
               #121683]
               <https://rt.cpan.org/Public/Bug/Display.html?id=121683> [cpan
               #122353]
               <https://rt.cpan.org/Public/Bug/Display.html?id=122353>


Selected Bug Fixes

       o   "/@0{0*->@*/*0" and similar contortions used to crash, but no
           longer do, but merely produce a syntax error.  [perl #128171]
           <https://rt.perl.org/Public/Bug/Display.html?id=128171>

       o   "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.  [perl #128182]
           <https://rt.perl.org/Public/Bug/Display.html?id=128182>

       o   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.  [perl #127952]
           <https://rt.perl.org/Public/Bug/Display.html?id=127952>

       o   "reset" with an argument no longer crashes when encountering stash
           entries other than globs.  [perl #128106]
           <https://rt.perl.org/Public/Bug/Display.html?id=128106>

       o   Assignment of hashes to, and deletion of, typeglobs named *::::::
           no longer causes crashes.  [perl #128086]
           <https://rt.perl.org/Public/Bug/Display.html?id=128086>

       o   Assignment variants of any bitwise ops under the "bitwise" feature
           would crash if the left-hand side was an array or hash.  [perl
           #128204] <https://rt.perl.org/Public/Bug/Display.html?id=128204>

       o   "socket" now leaves the error code returned by the system in $! on
           failure.  [perl #128316]
           <https://rt.perl.org/Public/Bug/Display.html?id=128316>

       o   Parsing bad POSIX charclasses no longer leaks memory.  [perl
           #128313] <https://rt.perl.org/Public/Bug/Display.html?id=128313>

       o   Since Perl 5.20, line numbers have been off by one when perl is
           invoked with the -x switch.  This has been fixed.  [perl #128508]
           <https://rt.perl.org/Public/Bug/Display.html?id=128508>

       o   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.  [perl #128597]
           <https://rt.perl.org/Public/Bug/Display.html?id=128597>

       o   Some regular expression parsing glitches could lead to assertion
           failures with regular expressions such as "/(?<=/" and "/(?<!/".
           This has now been fixed.  [perl #128170]
           <https://rt.perl.org/Public/Bug/Display.html?id=128170>

       o   "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.  [perl #128740]
           <https://rt.perl.org/Public/Bug/Display.html?id=128740>

       o   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.  [perl #126482]
           <https://rt.perl.org/Public/Bug/Display.html?id=126482>

       o   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.  [perl #128967]
           <https://rt.perl.org/Public/Bug/Display.html?id=128967>.

       o   "@{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.  [perl #128951]
           <https://rt.perl.org/Public/Bug/Display.html?id=128951>

       o   A regression in Perl 5.24 with "tr/\N{U+...}/foo/" when the code
           point was between 128 and 255 has been fixed.  [perl #128734]
           <https://rt.perl.org/Public/Bug/Display.html?id=128734>.

       o   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".  [perl #128843]
           <https://rt.perl.org/Public/Bug/Display.html?id=128843> [perl
           #128888] <https://rt.perl.org/Public/Bug/Display.html?id=128888>
           [perl #128889]
           <https://rt.perl.org/Public/Bug/Display.html?id=128889> [perl
           #128890] <https://rt.perl.org/Public/Bug/Display.html?id=128890>
           [perl #128893]
           <https://rt.perl.org/Public/Bug/Display.html?id=128893> [perl
           #128909] <https://rt.perl.org/Public/Bug/Display.html?id=128909>
           [perl #128919]
           <https://rt.perl.org/Public/Bug/Display.html?id=128919>

       o   The parser could sometimes crash if a bareword came after
           "evalbytes".  [perl #129196]
           <https://rt.perl.org/Public/Bug/Display.html?id=129196>

       o   Fixed a place where the regex parser was not setting the syntax
           error correctly on a syntactically incorrect pattern.  [perl
           #129122] <https://rt.perl.org/Public/Bug/Display.html?id=129122>

       o   A vulnerability in Perl's "sprintf" implementation has been fixed
           by avoiding a possible memory wrap.  [perl #131260]
           <https://rt.perl.org/Public/Bug/Display.html?id=131260>


Acknowledgements

       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 Mannsaaker, 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 AUTHORS file in the Perl source distribution.


Reporting Bugs

       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.


SEE ALSO

       The Changes file for an explanation of how to view exhaustive details
       on what changed.

       The INSTALL file for how to build Perl.

       The README file for general stuff.

       The Artistic and Copying files for copyright information.



perl v5.24.3                      2017-09-22                PERL5243DELTA(1pm)

perl 5.24.3 - Generated Thu Nov 2 19:25:26 CDT 2017
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