Section: Perl Programmers Reference Guide (1)
Return to Main Contents
perl582delta - what is new for perl v5.8.2
This document describes differences between the 5.8.1 release and
the 5.8.2 release.
If you are upgrading from an earlier release such as 5.6.1, first read
the perl58delta, which describes differences between 5.6.0 and
5.8.0, and the perl581delta, which describes differences between
5.8.0 and 5.8.1.
For threaded builds for modules calling certain re-entrant system calls,
binary compatibility was accidentally lost between 5.8.0 and 5.8.1.
Binary compatibility with 5.8.0 has been restored in 5.8.2, which
necessitates breaking compatibility with 5.8.1. We see this as the
lesser of two evils.
This will only affect people who have a threaded perl 5.8.1, and compiled
modules which use these calls, and now attempt to run the compiled modules
with 5.8.2. The fix is to re-compile and re-install the modules using 5.8.2.
The hash randomisation introduced with 5.8.1 has been amended. It
transpired that although the implementation introduced in 5.8.1 was source
compatible with 5.8.0, it was not binary compatible in certain cases. 5.8.2
contains an improved implementation which is both source and binary
compatible with both 5.8.0 and 5.8.1, and remains robust against the form of
attack which prompted the change for 5.8.1.
We are grateful to the Debian project for their input in this area.
See Algorithmic Complexity Attacks in perlsec for the original
rationale behind this change.
Several memory leaks associated with variables shared between threads
have been fixed.
Modules and Pragmata
Updated Modules And Pragmata
The following modules and pragmata have been updated since Perl 5.8.1:
Selected Bug Fixes
Some syntax errors involving unrecognized filetest operators are now handled
correctly by the parser.
Interpreter initialization is more complete when -DMULTIPLICITY is off.
This should resolve problems with initializing and destroying the Perl
interpreter more than once in a single process.
Platform Specific Problems
Dynamic linker flags have been tweaked for Solaris and OS X, which should
solve problems seen while building some XS modules.
Bugs in OS/2 sockets and tmpfile have been fixed.
In OS X setreuid and friends are troublesome - perl will now work
around their problems as best possible.
Starting with 5.8.3 we intend to make more frequent maintenance releases,
with a smaller number of changes in each. The intent is to propagate
bug fixes out to stable releases more rapidly and make upgrading stable
releases less of an upheaval. This should give end users more
flexibility in their choice of upgrade timing, and allow them easier
assessment of the impact of upgrades. The current plan is for code freezes
5.8.3 23:59:59 GMT, Wednesday December 31st 2003
5.8.4 23:59:59 GMT, Wednesday March 31st 2004
5.8.5 23:59:59 GMT, Wednesday June 30th 2004
with the release following soon after, when testing is complete.
See Future Directions in perl581delta for more soothsaying.
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://bugs.perl.org/. There may also be
information at http://www.perl.com/, 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 email@example.com to be
analysed by the Perl porting team. You can browse and search
the Perl 5 bugs at http://bugs.perl.org/
The Changes file for 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.
- Incompatible Changes
- Core Enhancements
- Hash Randomisation
- Modules and Pragmata
- Updated Modules And Pragmata
- Selected Bug Fixes
- Changed Internals
- Platform Specific Problems
- Future Directions
- Reporting Bugs
- SEE ALSO
This document was created by
using the manual pages.