From: j at pureftpd dot org
Operating system: Any
PHP version: 5.2.0
PHP Bug Type: Filesystem function related
Bug description: symbolic links should not be inserted into the realpath cache
Description:
------------
realpath() on a symlink returns the final file the link
points to.
Caching symbolic links through the realpath cache can cause
unexpected behaviors.
Here's a fix against PHP 5.2.0
--- TSRM/tsrm_virtual_cwd.c.orig Sat Nov 4 00:56:05
2006
+++ TSRM/tsrm_virtual_cwd.c Sat Nov 4 00:58:03 2006
@@ -562,7 +562,11 @@
}
if (use_realpath && CWDG(realpath_cache_size_limit))
{
- realpath_cache_add(path, path_length, state-
>cwd, state->cwd_length, t TSRMLS_CC);
+ struct stat buf;
+
+ if (lstat(path, &buf) == 0 && !S_ISLNK
(buf.st_mode)) { +
realpath_cache_add(path, path_length, state->cwd, state-
>cwd_length, t TSRMLS_CC);
+ }
}
if (verify_path && verify_path(state)) {
Reproduce code:
---------------
See bug #36555, or that code :
<?php
@unlink('/tmp/1link');
@unlink('/tmp/1tmp');
@unlink('/tmp/testfile1');
file_put_contents('/tmp/testfile1', '42');
symlink('/tmp/testfile1', '/tmp/1tmp');
rename('/tmp/1tmp', '/tmp/1link');
$a = file_get_contents('/tmp/1link');
var_dump($a);
unlink('/tmp/1link');
clearstatcache();
$a = file_get_contents('/tmp/1link');
var_dump($a);
?>
Expected result:
----------------
The second file_get_contents() should fail because /tmp/1link
has been unlinked.
But it doesn't.
Actual result:
--------------
42
42
--
Edit bug report at http://bugs.php.net/?id=39367&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=39367&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=39367&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=39367&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=39367&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=39367&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=39367&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=39367&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=39367&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=39367&r=support
Expected behavior: http://bugs.php.net/fix.php?id=39367&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=39367&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=39367&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=39367&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39367&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=39367&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=39367&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=39367&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=39367&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=39367&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=39367&r=mysqlcfg
