Bug #52368 [Com]: crash in preg_replace_impl
Edit report at http://bugs.php.net/bug.php?id=52368&edit=1
ID: 52368
Comment by: cobexer at gmail dot com
Reported by: cobexer at gmail dot com
Summary: crash in preg_replace_impl
Status: Feedback
Type: Bug
Package: PCRE related
Operating System: Debian Lenny (5.0.5)
PHP Version: 5.2.13
Block user comment: N
New Comment:
hmm that crash is hard to nail down,
it doesn't crash on all of my computers, therefore i did the following:
* created crashing test script (currently ~150 Lines)
* compiled php 5.2.14 (with -O0) (in /php) on a i586 openSUSE Factory(a
bit newer than 11.3)
* created a core dump
* tar'gz ed it together
and uploaded that to http://gomorrah-online.de/php-5.2.14-crash.tar.gz
important contents:
scrash.php : the php script with the code to crash (run with php -e)
scrash.php.log : the output of the script till it crashed
php-bt.txt : output of "bt" and "bt full"
core : the coredump itself
maybe that helps already,
regards cobexer
Previous Comments:
------------------------------------------------------------------------
[2010-07-18 19:39:03] felipe@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.
------------------------------------------------------------------------
[2010-07-17 23:48:30] cobexer at gmail dot com
Description:
------------
the crash occuring is most likely related to very high integer/double
values(>10M) being inserted in a long string(~20K).
the problem does not occur on PHP5.3.something so it might be a simple
backport :). unless somebody can tell me how i get more information out
of the crashing process this is all i have (trying to print local
variables of the crashing function results in:
(gdb) p **regex
Cannot access memory at address 0x686f72393438343e
os similar
the regular expression involved is most likely:
'/\{([A-Z0-9_]*)(?:\|(?P<escaper>[A-Z0-9_]+))?\}/'
executed by preg_replace_callback, where the callback is an
array('class_name', 'some_private_function')
if required i try to build a small test script and attach that - but i
guess its not required.
probably related to http://bugs.php.net/bug.php?id=39016
reproducible: always
Test script:
---------------
<?php
//no test script currently available
?>
Expected result:
----------------
no php crash correctly replaced string
Actual result:
--------------
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f877c078750 (LWP 6259)]
preg_replace_impl (ht=5, return_value=0x12a8a90,
return_value_ptr=0x137c970, this_ptr=0xb9e82fb02f28a27c,
return_value_used=0, is_callable_replace=0 '\0')
at /usr/src/php5/source/php5-5.2.13/Zend/zend_variables.h:32
warning: Source file is more recent than executable.
32 if (zvalue->type <= IS_BOOL) {
(gdb) bt
#0 preg_replace_impl (ht=5, return_value=0x12a8a90,
return_value_ptr=0x137c970, this_ptr=0xb9e82fb02f28a27c,
return_value_used=0,
is_callable_replace=0 '\0') at
/usr/src/php5/source/php5-5.2.13/Zend/zend_variables.h:32
#1 0x00007f8774cef3cd in zend_do_fcall_common_helper_SPEC
(execute_data=0x7fffffff5410) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:200
#2 0x00007f8774cd8134 in execute (op_array=0xf02040) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:92
#3 0x00007f8774ceecde in zend_do_fcall_common_helper_SPEC
(execute_data=0x7fffffff5760) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:234
#4 0x00007f8774cd8134 in execute (op_array=0xef48b0) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:92
#5 0x00007f8774ceecde in zend_do_fcall_common_helper_SPEC
(execute_data=0x7fffffff5e70) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:234
#6 0x00007f8774cd8134 in execute (op_array=0xf03780) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:92
#7 0x00007f8774ceecde in zend_do_fcall_common_helper_SPEC
(execute_data=0x7fffffff6330) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:234
#8 0x00007f8774cd8134 in execute (op_array=0xf02c90) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:92
#9 0x00007f8774ceecde in zend_do_fcall_common_helper_SPEC
(execute_data=0x7fffffff9ac0) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:234
#10 0x00007f8774cd8134 in execute (op_array=0xa2aa70) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:92
#11 0x00007f8774cb41c8 in zend_execute_scripts (type=32767, retval=0x0,
file_count=-25624) at /usr/src/php5/source/php5-5.2.13/Zend/zend.c:1215
#12 0x00007f8774c6e0ea in php_execute_script (primary_file=Cannot access
memory at address 0x8000ffff8b50
) at /usr/src/php5/source/php5-5.2.13/main/main.c:2058
#13 0x00007f8774d2aa73 in php_handler (r=0x7f877423690a) at
/usr/src/php5/source/php5-5.2.13/sapi/apache2handler/sapi_apache2.c:643
#14 0x0000000000438f73 in ap_run_handler (r=0xecc9a8) at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/server/config.c:159
#15 0x000000000043c53f in ap_invoke_handler (r=0xecc9a8) at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/server/config.c:373
#16 0x000000000044970e in ap_process_request (r=0xecc9a8)
at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/modules/http/http_request.c:258
#17 0x0000000000446838 in ap_process_http_connection (c=0xdfec88)
at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/modules/http/http_core.c:190
#18 0x0000000000440493 in ap_run_process_connection (c=0xdfec88) at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/server/connection.c:43
#19 0x000000000044dd10 in child_main (child_num_arg=<value optimized
out>)
at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/server/mpm/prefork/prefork.c:680
#20 0x000000000044e064 in make_child (s=0x675968, slot=1)
at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/server/mpm/prefork/prefork.c:777
#21 0x000000000044e60c in ap_mpm_run (_pconf=<value optimized out>,
plog=<value optimized out>, s=0x675968)
at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/server/mpm/prefork/prefork.c:795
#22 0x0000000000425be5 in main (argc=3, argv=0x7fffffffc558) at
/build/buildd-apache2_2.2.9-10+lenny8-amd64-OpzZ7v/apache2-2.2.9/server/main.c:732
(gdb) bt full
#0 preg_replace_impl (ht=5, return_value=0x12a8a90,
return_value_ptr=0x137c970, this_ptr=0xb9e82fb02f28a27c,
return_value_used=0,
is_callable_replace=0 '\0') at
/usr/src/php5/source/php5-5.2.13/Zend/zend_variables.h:32
regex = (zval **) 0xa155b0
replace = (zval **) 0xa155b8
subject = (zval **) 0xa155c0
limit = (zval **) 0x7f8774cd1a4d
subject_entry = (zval **) 0xa155c8
zcount = (zval **) 0x7f8774d1b868
result = 0x12a8a08 "�\220*\001"
result_len = 0
limit_val = -1
string_key = 0x10 <Address 0x10 out of bounds>
num_key = 19345208
callback_name = 0xef2b88 "pE9\001"
replace_count = 10573224
replace_count_ptr = (int *) 0x7fffffff4cd0
#1 0x00007f8774cef3cd in zend_do_fcall_common_helper_SPEC
(execute_data=0x7fffffff5410) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:200
return_reference = 1 '\001'
opline = (zend_op *) 0x8
original_return_value = (zval **) 0x80a370
current_scope = (zend_class_entry *) 0xf04fe8
current_this = (zval *) 0x0
return_value_used = 0
should_change_scope = 41 ')'
#2 0x00007f8774cd8134 in execute (op_array=0xf02040) at
/usr/src/php5/source/php5-5.2.13/Zend/zend_vm_execute.h:92
execute_data = Cannot access memory at address 0x8000ffff5410
(gdb)
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