Bug #61339 [Opn]: is_readable() causes crash in special cases

Edit report at https://bugs.php.net/bug.php?id=61339&edit=1 ID: 61339 User updated by: ziegenberg at web dot de Reported by: ziegenberg at web dot de Summary: is_readable() causes crash in special cases Status: Open Type: Bug Package: Filesystem function related Operating System: Windows 7 Pro 64bit PHP Version: 5.3.10 Block user comment: N Private report: N New Comment: Here is a crash report I found, perhaps this helps: ----- Version=1 EventType=APPCRASH EventTime=129758533564007575 ReportType=2 Consent=1 ReportIdentifier=214d7de4-6aa6-11e1-bd6c-4c8093870ef0 IntegratorReportIdentifier=214d7de3-6aa6-11e1-bd6c-4c8093870ef0 WOW64=1 Response.type=4 Sig[0].Name=Anwendungsname Sig[0].Value=httpd.exe Sig[1].Name=Anwendungsversion Sig[1].Value=2.2.22.0 Sig[2].Name=Anwendungszeitstempel Sig[2].Value=4f4a84ad Sig[3].Name=Fehlermodulname Sig[3].Value=php5ts.dll Sig[4].Name=Fehlermodulversion Sig[4].Value=5.3.9.0 Sig[5].Name=Fehlermodulzeitstempel Sig[5].Value=4f591617 Sig[6].Name=Ausnahmecode Sig[6].Value=c0000005 Sig[7].Name=Ausnahmeoffset Sig[7].Value=000a57a0 DynamicSig[1].Name=Betriebsystemversion DynamicSig[1].Value=6.1.7601.2.1.0.256.48 DynamicSig[2].Name=Gebietsschema-ID DynamicSig[2].Value=1031 DynamicSig[22].Name=Zusatzinformation 1 DynamicSig[22].Value=0a9e DynamicSig[23].Name=Zusatzinformation 2 DynamicSig[23].Value=0a9e372d3b4ad19135b953a78882e789 DynamicSig[24].Name=Zusatzinformation 3 DynamicSig[24].Value=0a9e DynamicSig[25].Name=Zusatzinformation 4 DynamicSig[25].Value=0a9e372d3b4ad19135b953a78882e789 UI[2]=C:\apache2\bin\httpd.exe UI[3]=Apache HTTP Server funktioniert nicht mehr UI[4]=Windows kann online nach einer Lösung für das Problem suchen. UI[5]=Online nach einer Lösung suchen (empfohlen) UI[6]=Später nach einer Lösung suchen (empfohlen) UI[7]=Schließen UI[8]=Apache HTTP Server wurde beendet und geschlossen. UI[9]=Die Anwendung wird aufgrund eines Problems nicht mehr richtig ausgeführt. Sie erhalten Nachricht, wenn eine Lösung verfügbar ist. UI[10]=S&chließen LoadedModule[0]=C:\apache2\bin\httpd.exe LoadedModule[1]=C:\Windows\SysWOW64\ntdll.dll LoadedModule[2]=C:\Windows\syswow64\kernel32.dll LoadedModule[3]=C:\Windows\syswow64\KERNELBASE.dll LoadedModule[4]=C:\apache2\bin\libhttpd.dll LoadedModule[5]=C:\Windows\syswow64\WS2_32.dll LoadedModule[6]=C:\Windows\syswow64\msvcrt.dll LoadedModule[7]=C:\Windows\syswow64\RPCRT4.dll LoadedModule[8]=C:\Windows\syswow64\SspiCli.dll LoadedModule[9]=C:\Windows\syswow64\CRYPTBASE.dll LoadedModule[10]=C:\Windows\SysWOW64\sechost.dll LoadedModule[11]=C:\Windows\syswow64\NSI.dll LoadedModule[12]=C:\Windows\system32\MSWSOCK.dll LoadedModule[13]=C:\Windows\syswow64\user32.dll LoadedModule[14]=C:\Windows\syswow64\GDI32.dll LoadedModule[15]=C:\Windows\syswow64\LPK.dll LoadedModule[16]=C:\Windows\syswow64\USP10.dll LoadedModule[17]=C:\Windows\syswow64\ADVAPI32.dll LoadedModule[18]=C:\apache2\bin\libaprutil-1.dll LoadedModule[19]=C:\apache2\bin\libapriconv-1.dll LoadedModule[20]=C:\apache2\bin\libapr-1.dll LoadedModule[21]=C:\Windows\syswow64\SHELL32.dll LoadedModule[22]=C:\Windows\syswow64\SHLWAPI.dll LoadedModule[23]=C:\Windows\system32\MSVCR100.dll LoadedModule[24]=C:\Windows\system32\IMM32.DLL LoadedModule[25]=C:\Windows\syswow64\MSCTF.dll LoadedModule[26]=C:\Windows\SysWOW64\nvinit.dll LoadedModule[27]=C:\Windows\System32\wship6.dll LoadedModule[28]=C:\Windows\System32\wshtcpip.dll LoadedModule[29]=C:\apache2\modules\mod_actions.so LoadedModule[30]=C:\apache2\modules\mod_alias.so LoadedModule[31]=C:\apache2\modules\mod_asis.so LoadedModule[32]=C:\apache2\modules\mod_auth_basic.so LoadedModule[33]=C:\apache2\modules\mod_authn_default.so LoadedModule[34]=C:\apache2\modules\mod_authn_file.so LoadedModule[35]=C:\apache2\modules\mod_authz_default.so LoadedModule[36]=C:\apache2\modules\mod_authz_groupfile.so LoadedModule[37]=C:\apache2\modules\mod_authz_host.so LoadedModule[38]=C:\apache2\modules\mod_authz_user.so LoadedModule[39]=C:\apache2\modules\mod_autoindex.so LoadedModule[40]=C:\apache2\modules\mod_cgi.so LoadedModule[41]=C:\apache2\modules\mod_deflate.so LoadedModule[42]=C:\apache2\bin\zlib1.dll LoadedModule[43]=C:\apache2\modules\mod_dir.so LoadedModule[44]=C:\apache2\modules\mod_env.so LoadedModule[45]=C:\apache2\modules\mod_expires.so LoadedModule[46]=C:\apache2\modules\mod_include.so LoadedModule[47]=C:\apache2\modules\mod_isapi.so LoadedModule[48]=C:\apache2\modules\mod_log_config.so LoadedModule[49]=C:\apache2\modules\mod_mime.so LoadedModule[50]=C:\apache2\modules\mod_negotiation.so LoadedModule[51]=C:\apache2\modules\mod_rewrite.so LoadedModule[52]=C:\apache2\modules\mod_setenvif.so LoadedModule[53]=C:\PHP\php5apache2_2.dll LoadedModule[54]=C:\PHP\php5ts.dll LoadedModule[55]=C:\Windows\syswow64\OLEAUT32.dll LoadedModule[56]=C:\Windows\syswow64\ole32.dll LoadedModule[57]=C:\Windows\system32\ODBC32.dll LoadedModule[58]=C:\Windows\system32\DNSAPI.dll LoadedModule[59]=C:\Windows\WinSxS\x86_microsoft.vc90.crt_1fc8b3b9a1e18e3b_9.0.30729.6161_none_50934f2ebcb7eb57\MSVCR90.dll LoadedModule[60]=C:\Windows\system32\odbcint.dll LoadedModule[61]=C:\PHP\ext\php_bz2.dll LoadedModule[62]=C:\PHP\ext\php_curl.dll LoadedModule[63]=C:\apache2\bin\LIBEAY32.dll LoadedModule[64]=C:\apache2\bin\SSLEAY32.dll LoadedModule[65]=C:\Windows\syswow64\WLDAP32.dll LoadedModule[66]=C:\PHP\ext\php_fileinfo.dll LoadedModule[67]=C:\PHP\ext\php_gd2.dll LoadedModule[68]=C:\PHP\ext\php_gettext.dll LoadedModule[69]=C:\PHP\ext\php_gmp.dll LoadedModule[70]=C:\PHP\ext\php_mbstring.dll LoadedModule[71]=C:\PHP\ext\php_mysql.dll LoadedModule[72]=C:\PHP\ext\php_mysqli.dll LoadedModule[73]=C:\PHP\ext\php_openssl.dll LoadedModule[74]=C:\PHP\ext\php_pdo_mysql.dll LoadedModule[75]=C:\PHP\ext\php_pdo_sqlite.dll LoadedModule[76]=C:\PHP\ext\php_soap.dll LoadedModule[77]=C:\PHP\ext\php_sockets.dll LoadedModule[78]=C:\PHP\ext\php_sqlite3.dll LoadedModule[79]=C:\PHP\ext\php_tidy.dll LoadedModule[80]=C:\PHP\ext\php_xmlrpc.dll LoadedModule[81]=C:\PHP\ext\php_xsl.dll LoadedModule[82]=C:\PHP\ext\php_exif.dll LoadedModule[83]=C:\PHP\ext\php_xdebug.dll FriendlyEventName=Nicht mehr funktionsfähig ConsentKey=APPCRASH AppName=Apache HTTP Server AppPath=C:\apache2\bin\httpd.exe ----- After installing the 5.3 snapshot the version named there is 5.3.9, but for 5.3.10 it's the same. Previous Comments: ------------------------------------------------------------------------ [2012-03-10 12:00:35] ziegenberg at web dot de I tested all the current Windows VC9 TS snapshots. Results: 5.3 -> error still present, also when using include() instead of is_readable(). 5.4 -> okay, no error. Trunk (5.5-dev?) -> okay, no error. ------------------------------------------------------------------------ [2012-03-10 11:33:34] pajoye@php.net is_readable does not read the file, so no, it is not what can causes a crash if the contents of the file changed or not. include and require may have a problem due to a bug in the parsing code, which is fixed in svn. Please try using a 5.3 snapshot. ------------------------------------------------------------------------ [2012-03-10 11:29:28] ziegenberg at web dot de Yes, it's the is_readable() function: ... $path = APPLICATION_PATH . DIRECTORY_SEPARATOR . $theme . DIRECTORY_SEPARATOR . 'layout' . DIRECTORY_SEPARATOR . str_replace('_', DIRECTORY_SEPARATOR, $layout) . '.layout.php'; if (!is_readable($path)) { $host = self::getHost(); throw new Cz_Request_Exception("Action configuration error: layout file '$path' for action '$action' and host '$host' does not exist or is not readable."); } ... The path seems to be a part of the problem, but the error depends on more factors. Here are some details of my research: 1) Not 8 spaces are required to create the error, one additional space is enough. This single space can be inserted somewhere in the file to produce the error. 2) I could reproduce it with two different paths, because the Apache directories in my tests where not the same. One is "C:\apache2" and the other is "C:\Apache24". The error occurred in both versions. 3) When I try to create a script to reproduce the bug I don't get an error. Also when I call is_readable() on the original file from there. 4) I renamed the template file. Same behaviour. 5) file_get_contents(), readfile(), file_exists(), file(), fopen() on the same file work as expected (no error). 6) include() and require() behave like is_readable() (error) Is there a way to get more debug information? ------------------------------------------------------------------------ [2012-03-10 10:13:11] pajoye@php.net And how is the path? Are you sure it is is_readable and not the include/require function which crashes? ------------------------------------------------------------------------ [2012-03-10 09:47:40] ziegenberg at web dot de Description: ------------ While I was working on some simple HTML templates I suddently got an error. Apache (2.2.22 or 2.4.1, both from apachelounge.com) didn't reply my request anymore. I spend hours with debugging and found the cause for the bug: a call of the is_readable() function, which checked the template file I have been working on. After further checks I found the "problem" in the file: 8 simple spaces, added by the editor as line indent. If I remove the spaces, everything works fine. If I add the spaces, php ends processing when calling is_readable() on the file. I can repeat it as often as I want - it's the same file, in the same directory, with the same rights. I wanted to create an example for you, but if I copy the file to another path, the error doesn't occur anymore. So the problem seems to be dependent of the file's path and content. Also PHP doesn't create an error, it just aborts the request (and the shutdown function isn't called). Test script: --------------- sorry, not possible Expected result: ---------------- TRUE for the call of is_readable(), as the file exists and is readable Actual result: -------------- crash ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=61339&edit=1