PHP :: Bug #75223 :: PCRE JIT broken in 7.2

Bug #75223	PCRE JIT broken in 7.2
Submitted:	2017-09-18 11:58 UTC	Modified:	2017-09-18 20:42 UTC
From:	giovanni at giacobbi dot net	Assigned:	cmb (profile)
Status:	Closed	Package:	PCRE related
PHP Version:	7.2.0RC2	OS:	Linux CentOS 7.4.1708
Private report:	No	CVE-ID:	None

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[2017-09-18 11:58 UTC] giovanni at giacobbi dot net

Description:
------------
There is a problem in preg_match() when JIT is enabled and when running through Apache2 with event MPM. This problem does not occur with command line invocation.

Here are the versions I tested, same environment:
7.1.9  works with PCRE JIT enabled
7.2.0alpha1   broken
7.2.0rc2  broken

Build command line:
./configure \
  --with-apxs2=/usr/local/apache2/bin/apxs \
  --disable-cgi \
  --enable-intl \
  --with-layout=GNU \
  --enable-maintainer-zts \
  --with-gettext=static \
  --with-iconv \
  --with-mysqli=mysqlnd \
  --enable-exif \
  --with-openssl \
  --with-curl


Test script:
---------------
var_dump(preg_match('/^a/', "a"));
var_dump(preg_match('/a/', "a"));


Expected result:
----------------
int(1)
int(1)

Actual result:
--------------
int(0)
segmentation fault

Patches

Pull Requests

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[2017-09-18 12:14 UTC] danack@php.net

Please provide a backtrace.

[2017-09-18 13:45 UTC] remi@php.net

Sorry, I cannot reproduce.

$ php72 -n -i | grep PCRE
PCRE (Perl Compatible Regular Expressions) Support => enabled
PCRE Library Version => 8.41 2017-07-05
PCRE JIT Support => enabled

$ php72 -n  foo.php 
int(1)
int(1)

[2017-09-18 14:05 UTC] levim@php.net

Remi, just to be sure: did you test it with Apache2 with event MPM? According to the reporter it does not occur with the command line, only with the Apache2 with event MPM SAPI.

[2017-09-18 14:53 UTC] cmb@php.net

-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb

[2017-09-18 14:53 UTC] cmb@php.net

Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read
http://bugs.php.net/bugs-generating-backtrace.php for *NIX and
http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.

[2017-09-18 18:36 UTC] giovanni at giacobbi dot net

-Status: Feedback +Status: Closed

[2017-09-18 18:36 UTC] giovanni at giacobbi dot net

I can confirm that the following fixes the issue:
https://github.com/php/php-src/commit/5ef10d08ec2d0823fb21ad189dacfb43d900a0b5

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