From: wharmby at uk dot ibm dot com
Operating system: Linux RHEL4
PHP version: 5CVS-2007-01-11 (snap)
PHP Bug Type: Scripting Engine problem
Bug description: php_fopen_primary_script() not thread safe
Description:
------------
The current implementation of php_fopen_primary_script()
uses the non-reentrant getpwnam() rather than the re-entrant
getpwnam_r(). Therefore calling it on a Linux ZTS enabled
build could lead to unpredictable/undesirable results. The
code should use the re-entrant version if it is available.
The following patch which were built against the latest snapshot (Jan 11
2007, 0730 GMT) modifies the code in
main/fopen_wrappers.c to use the re-entrant getpwnam_r if
its available:
http://pastebin.ca/312969
Fix tested on Linux RHEL4 with Apache 2.0.52 and user_dir set in php.ini
The modified code was then driven by specifying the ~user_id in the URL
e.g
http://localhost/~andy/phpinfo.php.
Reproduce code:
---------------
Problem found by code inspection. As with most thread safety
issues difficult to produce a simple testcase which will show
a reproducible crash but current Linux executable is clearly
not reentrant and therefore not thread safe.
Expected result:
----------------
N/A
Actual result:
--------------
N/A
--
Edit bug report at http://bugs.php.net/?id=40098&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=40098&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=40098&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=40098&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=40098&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=40098&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=40098&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=40098&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=40098&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=40098&r=support
Expected behavior: http://bugs.php.net/fix.php?id=40098&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=40098&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=40098&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=40098&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40098&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=40098&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=40098&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=40098&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=40098&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=40098&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=40098&r=mysqlcfg
