Bug 1119320

Summary: Zero-minimum possessive groups does not match empty string in
Product: Red Hat Enterprise Linux 7 Reporter: Petr Pisar <ppisar>
Component: pcreAssignee: Petr Pisar <ppisar>
Status: CLOSED ERRATA QA Contact: Jan Kepler <jkejda>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.1CC: isenfeld, jkejda, jorton, lmiksik, pbokoc
Target Milestone: rcKeywords: Patch
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
URL: http://bugs.exim.org/show_bug.cgi?id=1500
Whiteboard:
Fixed In Version: pcre-8.32-15.el7 Doc Type: Bug Fix
Doc Text:
A bug in PCRE was causing it to match the wrong substring in regular expressions with empty-matching possessive zero-repeat groups. This problem has been fixed and matching these groups now behaves as expected.
 Story Points: ---
Clone Of: 1119241 Environment:
Last Closed: 2015-11-19 05:15:01 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Upstream patch ported to 8.33 none

Description Petr Pisar 2014-07-14 13:53:45 UTC 
+++ This bug was initially created as a clone of Bug #1119241 +++

The JIT mode and Perl matches like this:

$ printf '%s\n%s\n' '/\A(?:[^"]++|"(?:[^"]*+|"")*+")++/' 'NON QUOTED "QUOT""ED" AFTER "NOT MATCHED' | pcretest -s++
PCRE version 8.33 2013-05-28

  re> data>  0: NON QUOTED "QUOT""ED" AFTER  (JIT)
data> 

While the interpreter mode does not:

$ printf '%s\n%s\n' '/\A(?:[^"]++|"(?:[^"]*+|"")*+")++/' 'NON QUOTED "QUOT""ED" AFTER "NOT MATCHED' | pcretest 
PCRE version 8.33 2013-05-28

  re> data>  0: NON QUOTED 
data> 

this is fixed with upstream commit:

commit d27238d61fdbd404b2caa5eac9332cdf76a604fc
Author: ph10 <ph10@2f5784b3-3f2a-0410-8824-cb99058d5e15>
Date:   Tue May 27 13:18:31 2014 +0000

    Fix empty-matching possessive zero-repeat groups bug.
    
    
    git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1478 2f5784b3-3f2a-0410-8824-cb99058d5e15

All Fedoras are affected.
----

RHEL-7 is affected (pcre-8.32-12.el7.x86_64).
Comment 1 Petr Pisar 2014-07-14 13:54:35 UTC 
Created attachment 917875 [details]
Upstream patch ported to 8.33
Comment 9 errata-xmlrpc 2015-11-19 05:15:01 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2142.html