ID: 39016
Updated by: [EMAIL PROTECTED]
Reported By: jan at horde dot org
-Status: Open
+Status: Feedback
-Bug Type: Reproducible crash
+Bug Type: PCRE related
Operating System: Linux
PHP Version: 5.2.0RC4
New Comment:
What do you get in GDB with
p subject
p **subject
p string_key
p num_key
?
Previous Comments:
------------------------------------------------------------------------
[2006-10-02 15:41:08] jan at horde dot org
I didn't try a snapshot since this happens with PHP 4, so I guess it's
an older issue that simply hasn't been triggered yet.
Here's the valgrind log:
==32185== Address 0xBEDDDD32 is on thread 1's stack
==32185==
==32185== Invalid read of size 4
==32185== at 0x449FCA7: preg_replace_impl (php_pcre.c:1307)
==32185== by 0x4767B6B: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:200)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== Address 0x1 is not stack'd, malloc'd or (recently) free'd
==32185==
==32185== Process terminating with default action of signal 11
(SIGSEGV)
==32185== Access not within mapped region at address 0x1
==32185== at 0x449FCA7: preg_replace_impl (php_pcre.c:1307)
==32185== by 0x4767B6B: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:200)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
==32185== by 0x475AFBC: execute (zend_vm_execute.h:92)
==32185== by 0x47675EA: zend_do_fcall_common_helper_SPEC
(zend_vm_execute.h:234)
------------------------------------------------------------------------
[2006-10-02 15:36:50] jan at horde dot org
I should add the lines of code that caused this, right? :)
$regexp = <<<EOR
/
# Version 1: mailto: links with any valid email characters.
# Pattern 1: Outlook parenthesizes in sqare brackets
(\[\s*)?
# Pattern 2: mailto: protocol prefix
(mailto:\s?)
# Pattern 3: email address
([^\s\?"<]*)
# Pattern 4 to 6: Optional parameters
((\?)([^\s"<]*[\w+#?\/&=]))?
# Pattern 7: Closing Outlook square bracket
((?(1)\s*\]))
|
# Version 2 Pattern 8: simple email addresses.
([EMAIL PROTECTED])
# Pattern 9 to 11: Optional parameters
((\?)([^\s"<]*[\w+#?\/&=]))?
/eix
EOR;
preg_replace($regexp,
'Text_Filter_emails::callback(\'' . $tag . '\', \'' .
$class . '\', \'$1\', \'$2\', \'$3\', \'$4\', \'$6\', \'$7\', \'$8\',
\'$9\', \'$11\')',
'a long list of email addresses etc.')
The regexp part that causes the problem, i.e. that no longer segfaults
if removed is the pattern #8.
------------------------------------------------------------------------
[2006-10-02 15:34:34] [EMAIL PROTECTED]
Did you try fresh snapshots?
Do you see anything interesting with valgrind?
------------------------------------------------------------------------
[2006-10-02 15:30:19] jan at horde dot org
Description:
------------
Using preg_replace to parse and process email address in certain email
message headers causes reproducable segfaults. Unfortunately these
don't happen in a stripped down preg_replace call, but only in the
context of a larger application. I was able to get a backtrace though
that might be helpful:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1210352992 (LWP 32029)]
0xb75f8ca7 in preg_replace_impl (ht=<value optimized out>,
return_value=0xb6560604, return_value_ptr=<value optimized out>,
this_ptr=0x0, return_value_used=1, is_callable_replace=0 '\0')
at /home/jan/software/php-5.2.0RC4/ext/pcre/php_pcre.c:1307
1307
switch(zend_hash_get_current_key(Z_ARRVAL_PP(subject), &string_key,
&num_key, 0))
(gdb) bt
#0 0xb75f8ca7 in preg_replace_impl (ht=<value optimized out>,
return_value=0xb6560604, return_value_ptr=<value optimized out>,
this_ptr=0x0, return_value_used=1, is_callable_replace=0 '\0')
at /home/jan/software/php-5.2.0RC4/ext/pcre/php_pcre.c:1307
#1 0xb78c0b6c in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfaf8090)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:200
#2 0xb78b3fbd in execute (op_array=0xb651143c)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:92
#3 0xb78c05eb in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfaf8560)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:234
#4 0xb78b3fbd in execute (op_array=0xb659a668)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:92
#5 0xb78c05eb in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfaf8860)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:234
#6 0xb78b3fbd in execute (op_array=0xb659b664)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:92
#7 0xb78c05eb in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfaf8e40)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:234
#8 0xb78b3fbd in execute (op_array=0xb65d7868)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:92
#9 0xb78c05eb in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfaf8fa0)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:234
#10 0xb78b3fbd in execute (op_array=0xb65d7798)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:92
#11 0xb78c05eb in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfaf9850)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:234
#12 0xb78b3fbd in execute (op_array=0xb66171b8)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:92
#13 0xb78c05eb in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfaf9ab0)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:234
#14 0xb78b3fbd in execute (op_array=0xb65d7934)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:92
#15 0xb78c05eb in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfb00890)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:234
#16 0xb78b3fbd in execute (op_array=0xb6eb227c)
at /home/jan/software/php-5.2.0RC4/Zend/zend_vm_execute.h:92
#17 0xb7898bb7 in zend_execute_scripts (type=8, retval=<value optimized
out>,
file_count=3) at /home/jan/software/php-5.2.0RC4/Zend/zend.c:1096
#18 0xb785b112 in php_execute_script (primary_file=0xbfb02bbc)
at /home/jan/software/php-5.2.0RC4/main/main.c:1759
#19 0xb790f73f in apache_php_module_main (r=0x80d4434,
display_source_mode=0)
at /home/jan/software/php-5.2.0RC4/sapi/apache/sapi_apache.c:53
#20 0xb79106d8 in send_php (r=0x80d4434, display_source_mode=0,
filename=0x0)
at /home/jan/software/php-5.2.0RC4/sapi/apache/mod_php5.c:665
#21 0xb7910926 in send_parsed_php (r=0x80d4434)
at /home/jan/software/php-5.2.0RC4/sapi/apache/mod_php5.c:680
#22 0x0806bd77 in ap_invoke_handler ()
#23 0x080823d9 in process_request_internal ()
#24 0x08082436 in ap_process_request ()
#25 0x08078b16 in child_main ()
#26 0x08078d4d in make_child ()
#27 0x08078ebd in startup_children ()
#28 0x0807958a in standalone_main ()
#29 0x08079e50 in main ()
The segfault happens in PHP 4 too.
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--
Edit this bug report at http://bugs.php.net/?id=39016&edit=1
