#33011 [Asn->Opn]: [PATCH] shmop: can still open segment for reading after shmop_delete
| From: | sniper@php.net | Date: | Sun, 06 Nov 2005 23:02:47 +0000 |
| Subject: | #33011 [Asn->Opn]: [PATCH] shmop: can still open segment for reading after shmop_delete | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-87725@lists.php.net to get a copy of this message | ||
ID: 33011
Updated by: sniper@php.net
Reported By: joe at bs0 dot com
-Status: Assigned
+Status: Open
Bug Type: Semaphore related
Operating System: win32 only
PHP Version: 5.0.4, 4.3.11
Assigned To: iliaa
Previous Comments:
------------------------------------------------------------------------
[2005-05-19 23:33:39] joe at bs0 dot com
patch: http://www.bs0.com/~joe/php/tsrm/tsrm_win32.diff
complete: http://www.bs0.com/~joe/php/tsrm/tsrm_win32.c
changes: http://www.bs0.com/~joe/php/tsrm/changes.txt
------------------------------------------------------------------------
[2005-05-18 14:29:34] derick@php.net
Put a patch on the web, and provide the URL here please. (And if you
can, provide a summary why it was wrong and how you fixed it).
------------------------------------------------------------------------
[2005-05-15 02:34:02] joe at bs0 dot com
as short as I can make it:
<?php
$toWrite = 'test string';
$shm_len = strlen($toWrite);
$shm_id = shmop_open(0xff3, "c", 0644, $shm_len);
shmop_write($shm_id, $toWrite, 0);
shmop_close($shm_id);
$shm_id = shmop_open(0xff3, "a", 0, 0);
$data = shmop_read($shm_id, 0, $shm_len);
shmop_close($shm_id);
$shm_id = shmop_open(0xff3, "w", 0, 0);
if (!shmop_delete($shm_id)) {
echo "Couldn't mark shared memory block for deletion.<br/>";
}
else {
echo "shared memory block marked for deletion.<br/>";
}
shmop_close($shm_id);
echo 'block closed.<br/>';
$shm_id = shmop_open(0xff3, "a", 0, 0);
if($shm_id) {
$data = shmop_read($shm_id, 0, $shm_len);
shmop_close($shm_id);
echo 'ERROR: Previously deleted block able to be opened.<br/>';
echo 'Data read : "' . $data . '"';
}
else {
echo 'Could not open previously deleted block.<br/>';
}
?>
------------------------------------------------------------------------
[2005-05-12 04:33:53] joe at bs0 dot com
Description:
------------
Tested with iis/php5.0.4, iis/php4.3.11, apache2/php4.3.11 - same
problem. after a succesful call to shmop_delete, the shared memory can
still be opened, and the previous values read in. Delete call seems to
have no effect.
Each step is done in new request:
1)Create shared memory block, populate with string.
2)open block, read in string
3)open block, call shmop_delete (returns true)
4)open block, read in string <- should not be able to open block for
reading at this point.
looks to be the same as Bug #28965, this bug has status of No Feedback,
so opening a new one.
Reproduce code:
---------------
Code to reproduce:
http://bs0.com/shmop/shmop_test.php.txt
Expected result:
----------------
leave only one step uncommented at a time, at step 4, the open should
fail and no data should be read in.
Actual result:
--------------
After step 4, memory is still opened/data is read in.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=33011&edit=1