#40624 [Fbk->Opn]: pcrelib broken with php 4.4.5

From: Date: Tue, 27 Feb 2007 23:39:20 +0000
Subject: #40624 [Fbk->Opn]: pcrelib broken with php 4.4.5
References: 1  Groups: php.bugs 
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 ID:               40624
 User updated by:  test_junk at hotmail dot it
 Reported By:      test_junk at hotmail dot it
-Status:           Feedback
+Status:           Open
 Bug Type:         PCRE related
 Operating System: linux 2.4 i386
 PHP Version:      4.4.5
 New Comment:

I couldn't isolate the code yet. However the full backtrace is the
following (I ran the same app twice):

1st time:

#0  0x081851f2 in match (eptr=0x61737361 <Address 0x61737361 out of
bounds>,
    ecode=0x2c69746c <Address 0x2c69746c out of bounds>,
offset_top=1919250464, md=0x7474656d,
    ims=1868852837, eptrb=0x736f6320, flags=1629531331,
rdepth=1702192160)
    at /sources/php/php-4.4.6/ext/pcre/pcrelib/pcre_exec.c:2209
#1  0x00000000 in ?? () 


2nd time:

#0  0x0818257f in match (eptr=0x61737361 <Address 0x61737361 out of
bounds>,
    ecode=0x2c69746c <Address 0x2c69746c out of bounds>,
offset_top=1919250464, md=0x7474656d,
    ims=1868852837, eptrb=0x736f6320, flags=1629531331,
rdepth=1702192160)
    at /sources/php/php-4.4.6/ext/pcre/pcrelib/pcre_exec.c:1071
Cannot access memory at address 0xbf7ffff0


Previous Comments:
------------------------------------------------------------------------

[2007-02-26 14:00:30] nlopess@php.net

also please post the whole backtrace, so that we can see what's
happening (it may be just a stack overflow..)

------------------------------------------------------------------------

[2007-02-26 08:58:27] tony2001@php.net

Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc. If the script requires a 
database to demonstrate the issue, please make sure it creates 
all necessary tables, stored procedures etc.

Please avoid embedding huge scripts into the report.



------------------------------------------------------------------------

[2007-02-26 00:24:41] test_junk at hotmail dot it

This snapshot is identical to the one I tested as far as I am seeing
comparing the 2 archives, however which files did you modify?

The only way I have to trigger this bug is recompiling the engine on a
production server but since it breaks several websites (Drupal seems to
be most affected) I can do it only at night so I can perform a limited
number of attempts.

------------------------------------------------------------------------

[2007-02-25 23:03:49] nlopess@php.net

Please try using this CVS snapshot:

  http://snaps.php.net/php4-STABLE-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php4-win32-STABLE-latest.zip

sorry, can you please try again a new snapshot? I made some changes a
few hours ago and I don't know if they made their way in the snapshot
you tested.
If it still doesn't work, please post the entire backtrace (or link to
an external page if it's too big). Also please try to isolate the code
that triggers the bug.

------------------------------------------------------------------------

[2007-02-25 22:14:37] test_junk at hotmail dot it

I compiled CVS 200702251930 but unfortunately the problem persists.

------------------------------------------------------------------------

The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
    http://bugs.php.net/40624

-- 
Edit this bug report at http://bugs.php.net/?id=40624&edit=1


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