| CC: | <alfredreibenschuh [...] gmx.net> |
| Subject: | stack overflow in the PDF::API2 |
| Date: | Tue, 18 Nov 2008 16:23:37 -0800 |
| To: | <bug-PDF-API2 [...] rt.cpan.org> |
| From: | "Sergei Fetisov" <sfetisov [...] stratify.com> |
Dear Alfred,
We are using the PDF::API2 package with ActiveState Perl 5.8 under
Windows XP/2003.
This is an extremely helpful package. Unfortunately, recently I found an
issue.
There is a non optimized regular expression at
PDF::API2::Basic::PDF::File package, line 648:
$str =~ /^((?:[^\\()]|\\[^()])*)(.*)/so;
Perl5.8 has a recursion code in the regexp engine.
The pattern could contain of a huge number of matches and invoke a deep
recursion.
So the regular expression engine is running out of stack space and it
causes segmentation fault.
For example, it happens when PDF file contains of the really big
metadata (e.g. 30000 characters in the Keywords field).
I think the next regular expression could be used instead and it should
resolve the issue:
$str =~ /^(\\?[^\\()]+)(.*)/so;
We are going to update the Perl version up to 5.10 in the future and it
has to fix the problem too.
In the meanwhile, we would like to let you know about the issue and it
will be great if you have a chance to fix it.
Thank you,
Sergei Fetisov
Senior Member of Technical Staff
Stratify, an Iron Mountain Company
501 Ellis Street
Mountain View, CA 94043
www.stratify.com
Phone: 650-963-3989
Fax: 650-988-2159
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