From: wharmby at uk dot ibm dot com
Operating system: Linux RHEL4
PHP version: 5CVS-2007-01-09 (snap)
PHP Bug Type: Scripting Engine problem
Bug description: php_get_current_user() not thread safe
Description:
------------
The current implementation of php_get_current_user() uses
the non-reentrant getpwuid() rather than the reentrant
getpwuid_r(). Therefore issuing on Linux in a 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 9 2007, 1330 GMT) modifies the code in
main/safe_mode.c to use the re-entrant getpwuid_r if its
available:
http://pastebin.ca/311144
Following makes necessary associated change to configure.in:
http://pastebin.ca/311140
Fix tested on Linux RHEL with mysql extension enabled and
sql.safe_mode=On in php.ini. The modified code can then easily be invoked
by issuing mysql_connect().
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.
Expected result:
----------------
N/A
Actual result:
--------------
N/A
--
Edit bug report at http://bugs.php.net/?id=40079&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=40079&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=40079&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=40079&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=40079&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=40079&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=40079&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=40079&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=40079&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=40079&r=support
Expected behavior: http://bugs.php.net/fix.php?id=40079&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=40079&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=40079&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=40079&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40079&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=40079&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=40079&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=40079&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=40079&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=40079&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=40079&r=mysqlcfg
