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



NAME
       perldelta - what is new for perl v5.12.5

DESCRIPTION
       This document describes differences between the 5.12.4 release and the 5.12.5 release.

       If you are upgrading from an earlier release such as 5.12.3, first read perl5124delta, which
       describes differences between 5.12.3 and 5.12.4.

Security
   "Encode" decode_xs n-byte heap-overflow (CVE-2011-2939)
       A bug in "Encode" could, on certain inputs, cause the heap to overflow.  This problem has been
       corrected.  Bug reported by Robert Zacek.

   "File::Glob::bsd_glob()" memory error with GLOB_ALTDIRFUNC (CVE-2011-2728).
       Calling "File::Glob::bsd_glob" with the unsupported flag GLOB_ALTDIRFUNC would cause an access
       violation / segfault.  A Perl program that accepts a flags value from an external source could expose
       itself to denial of service or arbitrary code execution attacks.  There are no known exploits in the
       wild.  The problem has been corrected by explicitly disabling all unsupported flags and setting
       unused function pointers to null.  Bug reported by Clement Lecigne.

   Heap buffer overrun in 'x' string repeat operator (CVE-2012-5195)
       Poorly written perl code that allows an attacker to specify the count to perl's 'x' string repeat
       operator can already cause a memory exhaustion denial-of-service attack. A flaw in versions of perl
       before 5.15.5 can escalate that into a heap buffer overrun; coupled with versions of glibc before
       2.16, it possibly allows the execution of arbitrary code.

       This problem has been fixed.

Incompatible Changes
       There are no changes intentionally incompatible with 5.12.4. If any exist, they are bugs and reports
       are welcome.

Modules and Pragmata
   Updated Modules
       B::Concise

       B::Concise no longer produces mangled output with the -tree option [perl #80632].

       charnames

       A regression introduced in Perl 5.8.8 has been fixed, that caused charnames::viacode(0) to return
       "undef" instead of the string "NULL" [perl #72624].

       Encode has been upgraded from version 2.39 to version 2.39__1.

       See "Security".

       File::Glob has been upgraded from version 1._7 to version 1._7__1.

       See "Security".

       Unicode::UCD

       The documentation for the "upper" function now actually says "upper", not "lower".

       Module::CoreList

       Module::CoreList has been updated to version 2.50_02 to add data for this release.

Changes to Existing Documentation
   perlebcdic
       The perlebcdic document contains a helpful table to use in "tr///" to convert between EBCDIC and
       Latin1/ASCII.  Unfortunately, the table was the inverse of the one it describes.  This has been
       corrected.

   perlunicode
       The section on User-Defined Case Mappings had some bad markup and unclear sentences, making parts of
       it unreadable.  This has been rectified.

   perluniprops
       This document has been corrected to take non-ASCII platforms into account.

Installation and Configuration Improvements
   Platform Specific Changes
       Mac OS X
           There have been configuration and test fixes to make Perl build cleanly on Lion and Mountain
           Lion.

       NetBSD
           The NetBSD hints file was corrected to be compatible with NetBSD 6.*

Selected Bug Fixes
       •   "chop" now correctly handles characters above "\x{7fffffff}" [perl #73246].

       •   "($<,$>) = (...)" stopped working properly in 5.12.0.  It is supposed to make a single
           "setreuid()" call, rather than calling "setruid()" and "seteuid()" separately.  Consequently it
           did not work properly.  This has been fixed [perl #75212].

       •   Fixed a regression of kill() when a match variable is used for the process ID to kill [perl
           #75812].

       •   "UNIVERSAL::VERSION" no longer leaks memory.  It started leaking in Perl 5.10.0.

       •   The C-level "my_strftime" functions no longer leaks memory.  This fixes a memory leak in
           "POSIX::strftime" [perl #73520].

       •   "caller" no longer leaks memory when called from the DB package if @DB::args was assigned to
           after the first call to "caller".  Carp was triggering this bug [perl #97010].

       •   Passing to "index" an offset beyond the end of the string when the string is encoded internally
           in UTF8 no longer causes panics [perl #75898].

       •   Syntax errors in "(?{...})" blocks in regular expressions no longer cause panic messages [perl
           #2353].

       •   Perl 5.10.0 introduced some faulty logic that made "U*" in the middle of a pack template
           equivalent to "U0" if the input string was empty.  This has been fixed [perl #90160].

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

Acknowledgements
       Perl 5.12.5 represents approximately 17 months of development since Perl 5.12.4 and contains
       approximately 1,900 lines of changes across 64 files from 18 authors.

       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
       5.12.5:

       Andy Dougherty, Chris 'BinGOs' Williams, Craig A. Berry, David Mitchell, Dominic Hargreaves, Father
       Chrysostomos, Florian Ragwitz, George Greer, Goro Fuji, Jesse Vincent, Karl Williamson, Leon Brocard,
       Nicholas Clark, Rafael Garcia-Suarez, Reini Urban, Ricardo Signes, Steve Hay, Tony Cook.

       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 http://rt.perl.org/perlbug/ .  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 please send it to perl5-security-report@perl.org. This points to
       a closed subscription unarchived mailing list, which includes all the core committers, who be able to
       help assess the impact of issues, figure out a resolution, and help co-ordinate the release of
       patches to mitigate or fix the problem across all platforms on which Perl is supported. Please only
       use this address for security issues in the Perl core, not for modules independently distributed on
       CPAN.

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 v5.12.5                                     2012-11-09                                 PERL5125DELTA(1)