Ubuntu Manpage: perl5222delta - what is new for perl v5.22.2

Provided by: perl-doc_5.34.0-3ubuntu1.4_all

NAME

       perl5222delta - what is new for perl v5.22.2

DESCRIPTION

       This document describes differences between the 5.22.1 release and the 5.22.2 release.

       If you are upgrading from an earlier release such as 5.22.0, first read perl5221delta, which describes
       differences between 5.22.0 and 5.22.1.

Security

   Fix out of boundary access in Win32 path handling
       This is CVE-2015-8608.  For more information see [GH #15067]
       <https://github.com/Perl/perl5/issues/15067>.

   Fix loss of taint in "canonpath()"
       This is CVE-2015-8607.  For more information see [GH #15084]
       <https://github.com/Perl/perl5/issues/15084>.

   Set proper umask before calling mkstemp(3)
       In 5.22.0 perl started setting umask to 0600 before calling mkstemp(3) and restoring it afterwards.  This
       wrongfully tells open(2) to strip the owner read and write bits from the given mode before applying it,
       rather than the intended negation of leaving only those bits in place.

       Systems that use mode 0666 in mkstemp(3) (like old versions of glibc) create a file with permissions
       0066, leaving world read and write permissions regardless of current umask.

       This has been fixed by using umask 0177 instead.

       [GH #15135] <https://github.com/Perl/perl5/issues/15135>

   Avoid accessing uninitialized memory in Win32 "crypt()"
       Validation that will detect both a short salt and invalid characters in the salt has been added.

       [GH #15091] <https://github.com/Perl/perl5/issues/15091>

   Remove duplicate environment variables from "environ"
       Previously, if an environment variable appeared more than once in "environ[]", %ENV would contain the
       last entry for that name, while a typical "getenv()" would return the first entry.  We now make sure %ENV
       contains the same as what "getenv()" returns.

       Secondly, we now remove duplicates from "environ[]", so if a setting with that name is set in %ENV we
       won't pass an unsafe value to a child process.

       This is CVE-2016-2381.

Incompatible Changes

       There are no changes intentionally incompatible with Perl 5.22.1.  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
       •   File::Spec has been upgraded from version 3.56 to 3.56_01.

           "canonpath()" now preserves taint.  See "Fix loss of taint in "canonpath()"".

       •   Module::CoreList has been upgraded from version 5.20151213 to 5.20160429.

           The  version number of Digest::SHA listed for Perl 5.18.4 was wrong and has been corrected.  Likewise
           for    the    version    number    of    Config    in    5.18.3    and    5.18.4.     [GH     #15202]
           <https://github.com/Perl/perl5/issues/15202>

Documentation

   Changes to Existing Documentation
       perldiag

       •   The  explanation  of  the  warning  "unable to close filehandle %s properly: %s" which can occur when
           doing an implicit close of a filehandle has been expanded and improved.

       perlfunc

       •   The documentation of "hex()" has been revised to clarify valid inputs.

Configuration and Compilation

       •   Dtrace builds now build successfully on systems with a newer dtrace that require an input object file
           that uses the probes in the .d file.

           Previously the probe would fail and cause a build failure.

           [GH #13985] <https://github.com/Perl/perl5/issues/13985>

       •   Configure no longer probes for libnm by default.  Originally this was the "New Math" library, but the
           name has been re-used by the GNOME NetworkManager.

           [GH #15115] <https://github.com/Perl/perl5/issues/15115>

       •   Configure now knows about gcc 5.

       •   Compiling perl with -DPERL_MEM_LOG now works again.

Platform Support

   Platform-Specific Notes
       Darwin
           Compiling perl with -Dusecbacktrace on Darwin now works again.

           [GH #15245] <https://github.com/Perl/perl5/issues/15245>

       OS X/Darwin
           Builds with both -DDEBUGGING and threading enabled would fail with a "panic: free  from  wrong  pool"
           error  when  built or tested from Terminal on OS X.  This was caused by perl's internal management of
           the environment conflicting with an atfork handler using the libc "setenv()" function to  update  the
           environment.

           Perl now uses "setenv()"/"unsetenv()" to update the environment on OS X.

           [GH #14955] <https://github.com/Perl/perl5/issues/14955>

       ppc64el
           The  floating  point  format  of  ppc64el  (Debian  naming for little-endian PowerPC) is now detected
           correctly.

       Tru64
           A test failure in t/porting/extrefs.t has been fixed.

Internal Changes

       •   An unwarranted assertion in "Perl_newATTRSUB_x()" has been removed.  If a stub subroutine  definition
           with  a prototype has been seen, then any subsequent stub (or definition) of the same subroutine with
           an attribute was causing an assertion failure because of a null pointer.

           [GH #15081] <https://github.com/Perl/perl5/issues/15081>

Selected Bug Fixes

       •   Calls to the placeholder &PL_sv_yes used internally when an "import()" or "unimport()"  method  isn't
           found now correctly handle scalar context.  [GH #14902] <https://github.com/Perl/perl5/issues/14902>

       •   The  "pipe()"  operator  would  assert  for "DEBUGGING" builds instead of producing the correct error
           message.  The condition asserted on is detected and reported on correctly without the assertions,  so
           the assertions were removed.  [GH #15015] <https://github.com/Perl/perl5/issues/15015>

       •   In  some  cases, failing to parse a here-doc would attempt to use freed memory.  This was caused by a
           pointer not being restored correctly.  [GH #15009] <https://github.com/Perl/perl5/issues/15009>

       •   Perl now reports more context when it sees an array where it expects to see an operator,  and  avoids
           an assertion failure.  [GH #14472] <https://github.com/Perl/perl5/issues/14472>

       •   If  a here-doc was found while parsing another operator, the parser had already read end of file, and
           the here-doc was not terminated, perl could produce an assertion or a segmentation fault.   This  now
           reliably       complains       about      the      unterminated      here-doc.       [GH      #14789]
           <https://github.com/Perl/perl5/issues/14789>

       •   Parsing beyond the end of the buffer when processing a "#line" directive  with  no  filename  is  now
           avoided.  [GH #15139] <https://github.com/Perl/perl5/issues/15139>

       •   Perl  5.22.0  added  support for the C99 hexadecimal floating point notation, but sometimes misparsed
           hex floats.  This has been fixed.  [GH #15120] <https://github.com/Perl/perl5/issues/15120>

       •   Certain regex patterns involving a complemented posix class in an inverted bracketed character class,
           and matching something else optionally would improperly fail to match.  An example of one that  could
           fail      is      "qr/_?[^\Wbar]\x{100}/".      This     has     been     fixed.      [GH     #15181]
           <https://github.com/Perl/perl5/issues/15181>

       •   Fixed an issue with "pack()" where "pack "H"" (and "pack "h"") could read past the source when  given
           a non-utf8 source and a utf8 target.  [GH #14977] <https://github.com/Perl/perl5/issues/14977>

       •   Fixed  some  cases  where  perl  would  abort  due to a segmentation fault, or a C-level assert.  [GH
           #14941]             <https://github.com/Perl/perl5/issues/14941>             [GH              #14962]
           <https://github.com/Perl/perl5/issues/14962> [GH #14963] <https://github.com/Perl/perl5/issues/14963>
           [GH          #14997]         <https://github.com/Perl/perl5/issues/14997>         [GH         #15039]
           <https://github.com/Perl/perl5/issues/15039> [GH #15247] <https://github.com/Perl/perl5/issues/15247>
           [GH #15251] <https://github.com/Perl/perl5/issues/15251>

       •   A   memory   leak   when   setting   $ENV{foo}   on   Darwin   has   been   fixed.     [GH    #14955]
           <https://github.com/Perl/perl5/issues/14955>

       •   Perl  now  correctly  raises  an  error  when  trying to compile patterns with unterminated character
           classes       while       there       are       trailing       backslashes.        [GH        #14919]
           <https://github.com/Perl/perl5/issues/14919>

       •   "NOTHING"  regops  and  "EXACTFU_SS"  regops  in "make_trie()" are now handled properly.  [GH #14945]
           <https://github.com/Perl/perl5/issues/14945>

       •   Perl now only tests "semctl()" if we have everything needed to use it.   In  FreeBSD  the  "semctl()"
           entry    point    may    exist,    but    it    can    be    disabled   by   policy.    [GH   #15180]
           <https://github.com/Perl/perl5/issues/15180>

       •   A regression that allowed undeclared barewords as hash keys  to  work  despite  strictures  has  been
           fixed.  [GH #15099] <https://github.com/Perl/perl5/issues/15099>

       •   As an optimization (introduced in Perl 5.20.0), "uc()", "lc()", "ucfirst()" and "lcfirst()" sometimes
           modify  their  argument  in-place  rather  than  returning  a  modified  copy.  The criteria for this
           optimization has been made stricter to avoid these functions  accidentally  modifying  in-place  when
           they should not, which has been happening in some cases, e.g. in List::Util.

       •   Excessive  memory usage in the compilation of some regular expressions involving non-ASCII characters
           has been reduced.  A more complete fix is forthcoming in Perl 5.24.0.

Acknowledgements

Perl 5.22.2 represents approximately 5 months of development since Perl 5.22.1 and contains approximately
3,000 lines of changes across 110 files from 24 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 1,500 lines of
changes to 52 .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 5.22.2:

Aaron Crane, Abigail, Andreas König, Aristotle Pagaltzis, Chris 'BinGOs' Williams, Craig A. Berry,
Dagfinn Ilmari Mannsåker, David Golden, David Mitchell, H.Merijn Brand, James E Keenan, Jarkko
Hietaniemi, Karen Etheridge, Karl Williamson, Matthew Horsfall, Niko Tyni, Ricardo Signes, Sawyer X,
Stevan Little, Steve Hay, Todd Rinaldo, Tony Cook, Vladimir Timofeev, 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 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 will 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.