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Bug #26977 PCRE related segmentation fault
Submitted: 2004-01-20 07:20 UTC Modified: 2004-01-20 19:07 UTC
From: martijn at grendelman dot net Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 4.3.4 OS: Debian Linux (testing)
Private report: No CVE-ID: None
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 [2004-01-20 07:20 UTC] martijn at grendelman dot net
Description:
------------
PHP crashes when using PEAR-DB. Looks like a problem with PCRE.

'./configure' '--prefix=/usr/local' '--with-apxs2=/usr/local/apache2/bin/apxs' '--with-regex=php' '--with-config-file-path=/usr/local/apache2/conf' '--disable-rpath' '--disable-debug' '--enable-memory-limit' '--enable-calendar' '--enable-sysvsem' '--enable-sysvshm' '--enable-track-vars' '--enable-trans-sid' '--enable-bcmath' '--with-bz2' '--enable-ctype' '--with-iconv' '--enable-exif' '--enable-ftp' '--enable-mbstring' '--with-pcre-regex=/usr' '--enable-shmop' '--enable-sockets' '--enable-wddx' '--with-xml=/usr' '--with-expat-dir=/usr' '--enable-yp' '--with-zlib' '--without-pgsql' '--disable-static' '--with-layout=GNU' '--with-curl=shared,/usr' '--with-dom=shared,/usr' '--with-zlib-dir=/usr' '--with-gd=shared,/usr' '--with-jpeg-dir=shared,/usr' '--with-xpm-dir=shared,/usr/X11R6' '--with-png-dir=shared,/usr' '--with-freetype-dir=shared,/usr' '--with-imap=shared,/usr' '--with-ldap=shared,/usr' '--with-mcal=shared,/usr' '--with-mhash=shared,/usr' '--with-mysql=shared,/usr' '--with-unixODBC=shared,/usr' '--enable-xslt' '--with-xslt-sablot=shared,/usr' '--with-ttf=shared,/usr' '--with-t1lib=shared,/usr' '--with-kerberos' '--enable-debug'

So, the PCRE library in /usr (from Debian) is used.

php.ini:
;extension=gd.so
extension=imap.so
;extension=curl.so
extension=ldap.so
extension=mysql.so
;extension=domxml.so
;extension=mcal.so
;extension=mhash.so
;extension=odbc.so

so not all shared modules are loaded.

pcre
PCRE (Perl Compatible Regular Expressions) Support 	enabled
PCRE Library Version 	3.9 02-Jan-2002

(gdb) run -X
Starting program: /usr/local/apache2/bin/httpd -X
[New Thread 1077983808 (LWP 24414)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1077983808 (LWP 24414)]
0x404c29d6 in php_pcre_match (ht=3, return_value=0x81df3f4, this_ptr=0x0, return_value_used=1, global=0)
    at /extra0/home/martijn/src/php-4.3.4/ext/pcre/php_pcre.c:442
442                                     name_idx = 0xff * name_table[0] + name_table[1];


Reproduce code:
---------------
<?
  include "DB.php";  // PEAR

  define("DBTYPE","mysql");
  define("DBUSER","user");
  define("DBPASS","password");
  define("DBSERV","localhost");
  define("DB","mydb");

  $dsn = DBTYPE."://".DBUSER.":".DBPASS."@".DBSERV."/".DB;
  $dbc = DB::connect($dsn);
  if (DB::isError($dbc)) {
    $page="dberror";
  }
  else {
    $dbc->setFetchMode(DB_FETCHMODE_ASSOC);
  }
  echo "test";
?>


Expected result:
----------------
The word "test" should have been displayed.

Actual result:
--------------
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1077983808 (LWP 24414)]
0x404c29d6 in php_pcre_match (ht=3, return_value=0x81df3f4, this_ptr=0x0, return_value_used=1, global=0)
    at /extra0/home/martijn/src/php-4.3.4/ext/pcre/php_pcre.c:442
442                                     name_idx = 0xff * name_table[0] + name_table[1];


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 [2004-01-20 07:44 UTC] martijn at grendelman dot net
This problem looks fixable by omitting '--with-pcre-regex=/usr', thus linking against the bundled library.

I'd like to point out that I've seen this problem on two quite different environments:

1. Debian Stable, Linux kernel 2.4.23, Apache 1.3.26 + PHP 4.1.2 (Debian packages), PCRE library (as reported by phpinfo()) 3.4 22-Aug-2000.

2. Debian Testing, Linux kerel 2.6.1, Apache 2.0.47 + PHP 4.3.4 (compiled from source), PCRE library (as reported by phpinfo()) 3.9 02-Jan-2002
 [2004-01-20 19:07 UTC] sniper@php.net
Not PHP bug, PCRE bug. (ALWAYS use the bundled pcre lib if you don't know what you're doing)

 
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