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[2006-08-25 21:14 UTC] phillip dot berndt at googlemail dot com
Description:
------------
When executing the code below, the function won't return but loop forever (or do something else, I don't know).
Reproduce code:
---------------
<?php
$foo = 'bla bla bla';
preg_match('/(?<!\w)(0x[\p{N}]+[lL]?|[\p{Nd}]+(e[\p{Nd}]*)?[lLdDfF]?)(?!\w)/', $foo);
?>
Expected result:
----------------
Something like that:
pberndt@locutus ~ $ time perl -e '$_="bla bla bla"; /(?<!\w)(0x[\p{N}]+[lL]?|[\p{Nd}]+(e[\p{Nd}]*)?[lLdDfF]?)(?!\w)/;'
real 0m0.017s
user 0m0.016s
sys 0m0.000s
Actual result:
--------------
pberndt@locutus ~ $ php
<?php
set_time_limit(10);
$foo = 'bla bla bla';
preg_match('/(?<!\w)(0x[\p{N}]+[lL]?|[\p{Nd}]+(e[\p{Nd}]*)?[lLdDfF]?)(?!\w)/', $foo);
?>
Fatal error: Maximum execution time of 10 seconds exceeded in /home/pberndt/- on line 4
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Last updated: Mon May 12 04:01:29 2025 UTC |
Same result for a fresh php5.2-200608261230 build. I don't know, whether this helps, but in this build I interrupted the process after about 10 seconds; here's the bt: #0 adjust_recurse (group=0x84706db "R", adjust=1, utf8=0, cd=0xbfd088e0) at /home/pberndt/php_snap/php5.2-200608261230/ext/pcre/pcrelib/pcre_compile.c:1117 #1 0x08080269 in compile_regex (options=0, oldims=0, brackets=0xbfd084a4, codeptr=0xbfd08344, ptrptr=0xbfd0837c, errorcodeptr=0xbfd084dc, lookbehind=0, skipbytes=0, firstbyteptr=0x0, reqbyteptr=0x0, bcptr=0x3d, cd=0xbfd088e0) at /home/pberndt/php_snap/php5.2-200608261230/ext/pcre/pcrelib/pcre_compile.c:2681 #2 0x0807e71a in compile_regex (options=0, oldims=0, brackets=0xbfd084a4, codeptr=0xbfd084a8, ptrptr=0xbfd084d8, errorcodeptr=0xbfd084dc, lookbehind=0, skipbytes=0, firstbyteptr=0x0, reqbyteptr=0x0, bcptr=0x3d, cd=0xbfd088e0) at /home/pberndt/php_snap/php5.2-200608261230/ext/pcre/pcrelib/pcre_compile.c:3177 #3 0x08081339 in php_pcre_compile2 (pattern=0xb7bdf6d8 "(?<!\\w)(0x[\\p{N}]+[lL]?|[\\p{Nd}]+(e[\\p{Nd}]*)?[lLdDfF]?)(?!\\w)", options=0, errorcodeptr=0x0, errorptr=0xbfd089a4, erroroffset=0xbfd089a8, tables=0x8470220 "") at /home/pberndt/php_snap/php5.2-200608261230/ext/pcre/pcrelib/pcre_compile.c:4983 #4 0x080829a3 in php_pcre_compile (pattern=0x0, options=0, errorptr=0x0, erroroffset=0x0, tables=0x0) at /home/pberndt/php_snap/php5.2-200608261230/ext/pcre/pcrelib/pcre_compile.c:3905 #5 0x0808bfad in pcre_get_compiled_regex_cache (regex=0xb7be4bd4 "/(?<!\\w)(0x[\\p{N}]+[lL]?|[\\p{Nd}]+(e[\\p{Nd}]*)?[lLdDfF]?)(?!\\w)/", regex_len=64) at /home/pberndt/php_snap/php5.2-200608261230/ext/pcre/php_pcre.c:324 #6 0x0808d225 in php_do_pcre_match (ht=2, return_value=0xb7be4c20, return_value_ptr=0x0, this_ptr=0x0, return_value_used=0, global=0) at /home/pberndt/php_snap/php5.2-200608261230/ext/pcre/php_pcre.c:457 #7 0x082292d7 in zend_do_fcall_common_helper_SPEC (execute_data=0xbfd08b60) at zend_vm_execute.h:200 #8 0x08228bdc in execute (op_array=0xb7be47d8) at zend_vm_execute.h:92 #9 0x0820dabe in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/pberndt/php_snap/php5.2-200608261230/Zend/zend.c:1095 #10 0x081cfb86 in php_execute_script (primary_file=0xbfd0b060) at /home/pberndt/php_snap/php5.2-200608261230/main/main.c:1759 #11 0x082963b0 in main (argc=1, argv=0xbfd0b144) at /home/pberndt/php_snap/php5.2-200608261230/sapi/cli/php_cli.c:1102This should be the problem: ChangeLog for PCRE ------------------ Version 6.7 04-Jul-06 [...] 4. When UTF-8 mode was not set, PCRE looped when compiling certain patterns containing an extended class (one that cannot be represented by a bitmap because it contains high-valued characters or Unicode property items, e.g. [\pZ]). Almost always one would set UTF-8 mode when processing such a pattern, but PCRE should not loop if you do not (it no longer does). [Detail: two cases were found: (a) a repeated subpattern containing an extended class; (b) a recursive reference to a subpattern that followed a previous extended class. It wasn't skipping over the extended class correctly when UTF-8 mode was not set.] [...]