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Bug #48592 Missing environment variables in CGI SAPI crashes on startup
Submitted: 2009-06-18 05:29 UTC Modified: 2009-06-18 06:32 UTC
From: gwynne@php.net Assigned:
Status: Closed Package: Reproducible crash
PHP Version: 5.3CVS-2009-06-18 (CVS) OS: Darwin9 (MacOS X 10.5)
Private report: No CVE-ID: None
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 [2009-06-18 05:29 UTC] gwynne@php.net 
Description:
------------
If certain environment variables are missing, with others present, when the CGI SAPI is called, it will crash early on with a NULL pointer dereference.

Reproduce code:
---------------
bash$ SERVER_NAME=anything SERVER_PORT=80 REDIRECT_STATUS=200 php-cgi

Expected result:
----------------
<a message about no input file, or waiting for input on STDIN>

Actual result:
--------------
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
0x90be0f30 in strlen ()
(gdb) bt
#0  0x90be0f30 in strlen ()
#1  0x00323dd3 in php_fopen_primary_script (file_handle=0xbfffea6c, tsrm_ls=0xf01a80) at cvs/php-5.3/main/fopen_wrappers.c:454
#2  0x0049bcb2 in main (argc=1, argv=0xbfffeb58) at cvs/php-5.3/sapi/cgi/cgi_main.c:1999

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 [2009-06-18 05:35 UTC] gwynne@php.net 
PHP config:

phpinfo()
PHP Version => 5.3.0RC4-dev

System => Darwin hostname 9.7.0 Darwin Kernel Version 9.7.0: Tue Mar 31 22:52:17 PDT 2009; root:xnu-1228.12.14~1/RELEASE_I386 i386
Build Date => Jun 14 2009 17:53:14
Configure Command =>  'cvs/php-5.3/configure'  '--prefix=/opt/php-5.3.0RC4-dev' '--disable-all' '--enable-cli' '--enable-cgi' '--enable-debug' '--enable-maintainer-zts' '--disable-short-tags' '--enable-posix' '--enable-session' '--with-zlib' '--with-pcre-regex=/sw/pcre' '--with-openssl=/sw/openssl' '--enable-xml' '--enable-libxml' '--with-libxml-dir=/sw/libxml2' '--with-iconv=/sw/libiconv' '--enable-filter' '--enable-ctype' '--enable-pdo' '--enable-sqlite-utf8' '--enable-dom' '--enable-hash' '--enable-tokenizer' '--disable-safe-mode' '--without-pear' '--with-bz2' '--enable-calendar' '--enable-pcntl' '--with-pdo-sqlite=/sw/sqlite' '--with-icu-dir=/sw/icu' '--with-ldap=/usr' '--with-ldap-sasl=/usr' '--enable-xmlreader' '--enable-xmlwriter' '--enable-zip' '--enable-ftp' '--with-gd' '--with-jpeg-dir=/usr' '--with-png-dir=/sw/libpng' '--enable-gd-native-ttf' '--with-imap=/sw/imap' '--with-imap-ssl=/sw/openssl' '--with-kerberos=/usr' '--with-mysql=/sw/mysql' '--with-pdo-mysql=/sw/mysql' '--with-mysqli=/sw/mysql/bin/mysql_config' '--with-xsl=/sw/libxslt' '--enable-simplexml' '--enable-json' '--enable-bcmath' '--enable-phar' '--enable-shmop' '--enable-sockets' '--with-sqlite' '--with-sqlite3=/sw/sqlite' '--with-pdo-sqlite=/sw/sqlite'
Server API => Command Line Interface
Virtual Directory Support => enabled
Configuration File (php.ini) Path => /opt/php-5.3.0RC4-dev/lib
Loaded Configuration File => /opt/php-5.3.0RC4-dev/lib/php.ini
Scan this dir for additional .ini files => (none)
Additional .ini files parsed => (none)
PHP API => 20041225
PHP Extension => 20090115
Zend Extension => 220090115
Zend Extension Build => API220090115,TS,debug
PHP Extension Build => API20090115,TS,debug
Debug Build => yes
Thread Safety => enabled
Zend Memory Manager => enabled
Zend Multibyte Support => disabled
IPv6 Support => enabled
Registered PHP Streams => https, ftps, compress.zlib, compress.bzip2, php, file, glob, data, http, ftp, phar, zip  
Registered Stream Socket Transports => tcp, udp, unix, udg, ssl, sslv3, sslv2, tls
Registered Stream Filters => zlib.*, bzip2.*, convert.iconv.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk


This program makes use of the Zend Scripting Language Engine:
Zend Engine v2.3.0, Copyright (c) 1998-2009 Zend Technologies
 [2009-06-18 06:01 UTC] gwynne@php.net 
Bit of further research: The bug appears to express itself when SERVER_NAME and REDIRECT_STATUS are set but SCRIPT_FILENAME isn't. The presence of absence of any other variables seems to be irrelevant.
 [2009-06-18 06:32 UTC] rasmus@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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