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http://bugs.exim.org/show_bug.cgi?id=1338
Summary: Crashes on not-very-long strings that work on other
versions
Product: PCRE
Version: 8.12
Platform: x86-64
URL: http://drupal.org/node/1917530
OS/Version: Windows
Status: NEW
Severity: bug
Priority: high
Component: Code
AssignedTo: ph10@???
ReportedBy: dan899@???
CC: pcre-dev@???
Platform is Windows PHP5.3.13, PCRE 8.12, from WampServer2.2. Previously worked
fine with PHP 5.2.11 (PCRE 7.8 I think) and on Unbuntu with PHP 5.3.2 (PCRE
7.8).
Search string (ending in newline):
description = "Helps readers share, bookmark, and email your articles and pages
using any service, such as Facebook, Twitter, Google+, StumbleUpon, and over
100 more using the <a href='
http://share.lockerz.com/' target='_blank'>Lockerz
Share / AddToAny</a> widget."
PHP code:
if (preg_match_all('
@^\s* # Start at the beginning of a line,
ignoring leading whitespace
((?:
[^=;\[\]]| # Key names cannot contain equal signs,
semi-colons or square brackets,
\[[^\[\]]*\] # unless they are balanced and not nested
)+?)
\s*=\s* # Key/value pairs are separated by equal
signs (ignoring white-space)
(?:
("(?:[^"]|(?<=\\\\)")*")| # Double-quoted string, which may contain
slash-escaped quotes/slashes
(\'(?:[^\']|(?<=\\\\)\')*\')| # Single-quoted string, which may contain
slash-escaped quotes/slashes
([^\r\n]*?) # Non-quoted string
)\s*$ # Stop at the next end of a line, ignoring
trailing whitespace
@msx', $data, $matches, PREG_SET_ORDER)) {
Result:
Crash. Apache resets the connection. The crash is very sensitive to the length
of the search string. Make it a little short and it works file. The positive
look-ahead assertion, i.e. (?<=\\)" seems to be the culprit.
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