Provided by: perl-doc_5.36.0-9ubuntu1.1_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.
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.