ID: 47520
Comment by: phpwnd at gmail dot com
Reported By: pahan at hubbitus dot spb dot su
Status: Open
Bug Type: PCRE related
Operating System: Linux
PHP Version: 5.3.0beta1
New Comment:
I forgot to add that in my case, lowering the value the
pcre.recursion_limit INI setting make preg_* functions fail instead of
making PHP segfault.
Previous Comments:
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[2009-03-02 10:01:52] phpwnd at gmail dot com
I'd like to add that you don't need such a complicated test case, you
can make preg_* segfault with just something like:
$str = str_repeat(' ', 2490);
preg_match('#(.)+#', $str);
On my computer, a 2490-chars string is long enough to make it segfaults
everytime. For some reason, 2489 chars will make it segfault only 1 out
of 5 runs and 2480 chars are perfectly fine. If I replace the regexp
with more capturing parenthesis such as #((.))+# that limit drops to
1500-or-so and that number decreases as the number of parenthesis
increases. Using non-capturing patterns such as #(?:.)+# doubles that
number.
Obviously, the bug is related to capturing patterns repetition,
assuming we're experiencing the same bug. I'll try to find a place where
to host a core dump.
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[2009-02-28 09:00:02] pahan at hubbitus dot spb dot su
Very apologize for mistake.
I'm fix rights now, please recheck.
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[2009-02-28 01:19:21] [email protected]
I cannot download the coredump file: "You don't have permission to
access /_temp/php-pcre-bug/2/core.10135 on this server."
Can you give us a backtrace?
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[2009-02-27 20:06:13] pahan at hubbitus dot spb dot su
I'm thrice check the previous reports about this issue. And what? All
closed as bogus, but segmentatoin fault still here! Where
solution/fix??? Even common workaraund of problem is absent.
Why it is bogus but not bug???
And also, please again read note: I use "Once-only subpattern", so,
this should prevent recursion as I can understand. Or not?
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[2009-02-27 19:37:00] [email protected]
Please, check the previous reports about this issue:
http://bugs.php.net/search.php?search_for=&boolean=1&limit=10&order_by=id&direction=DESC&cmd=display&status=Bogus&bug_type%5B%5D=PCRE+related&php_os=&phpver=&assign=&author_email=&bug_age=0
http://docs.php.net/manual/en/pcre.configuration.php
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http://bugs.php.net/47520
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