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Posted to issues@lucy.apache.org by "Nick Wellnhofer (JIRA)" <ji...@apache.org> on 2015/05/16 18:52:59 UTC

[lucy-issues] [jira] [Created] (CLOWNFISH-44) Immutable Strings can be changed from Perl

Nick Wellnhofer created CLOWNFISH-44:
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             Summary: Immutable Strings can be changed from Perl
                 Key: CLOWNFISH-44
                 URL: https://issues.apache.org/jira/browse/CLOWNFISH-44
             Project: Apache Lucy-Clownfish
          Issue Type: Bug
          Components: Perl
            Reporter: Nick Wellnhofer
            Priority: Minor


Perl can hold a reference to a string passed to Clownfish and subsequently change the string via this reference in a callback. This violates the assumption that Clownfish strings are immutable and can lead to crashes if the string buffer is reallocated.

This scenario is somewhat contrived but for a proper fix, I think there's no other way than to always copy Perl strings passed as arguments. Fortunately, newer Perls support copy-on-write strings (default since 5.20) which makes this operation cheap.



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