From: registrace at koren dot cz
Operating system: Linux
PHP version: 5.2.6
PHP Bug Type: Filesystem function related
Bug description: is_writable() returns bogus result
Description:
------------
PHP Function is_writable() sometimes reports false results.
Requirements: Linux - getuid() != geteuid()
After inspection of PHP source, I realized, that is_writable() internally
uses syscall access(2). In turn, access(2) man page (on Linux) says:
The check is done with the calling processâs real UID and GID,
rather
than with the effective IDs as is done when actually
attempting an
operation. This is to allow set-user-ID programs to easily
determine
the invoking userâs authority.
Reproduce code:
---------------
<?
$file = "testfile.txt";
echo "GetUID: " . posix_getuid() . "/" . posix_geteuid() . "<br />";
echo "file is writable " . (is_writable($file)?"TRUE":"FALSE") . "<br
/>";
fopen("testfile.txt", 'wt');
echo ("file created");
?>
Expected result:
----------------
Expected result:
either:
file is writable TRUE
file created
or
file is writable FALSE
ERROR
Actual result:
--------------
GetUID: 933/10099
file is writable FALSE
file created
--
Edit bug report at http://bugs.php.net/?id=46498&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=46498&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=46498&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=46498&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=46498&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=46498&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=46498&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=46498&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=46498&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=46498&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=46498&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=46498&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=46498&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=46498&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=46498&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=46498&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=46498&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=46498&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=46498&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=46498&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=46498&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=46498&r=mysqlcfg
