PERL5222DELTA(1) Perl Programmers Reference Guide PERL5222DELTA(1)
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.
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