php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #60820 User cache corruption: hash keys are lost
Submitted: 2012-01-20 18:40 UTC Modified: 2013-02-18 00:35 UTC
From: uw@php.net Assigned: gopalv (profile)
Status: No Feedback Package: APC (PECL)
PHP Version: 5.4SVN-2012-01-20 (SVN) OS:
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome! If you don't have a Git account, you can't do anything here.
You can add a comment by following this link or if you reported this bug, you can edit this bug over here.
Block user comment
Status: Assign to:
Package:
Bug Type:
Summary:
From: uw@php.net
New email:
PHP Version: OS:

 

 [2012-01-20 18:40 UTC] uw@php.net
Description:
------------
APC: pecl/svn - trunk (Revision 322504)
PHP: 5_4, svn - PHP 5.4.0RC7-dev
Static build: ./configure  --enable-apc --enable-debug --enable-maintainer-zts


The APC user cache returns corrupted hashes. Hash keys are not preserved. arKey is not copied when duplicating a Bucket to be returned to the user. This can be fixed, for example, like this:

nixnutz@linux-0v4u:~/php-src/branches/PHP_5_4/ext/apc> svn diff
Index: apc_compile.c
===================================================================
--- apc_compile.c       (Revision 322504)
+++ apc_compile.c       (Arbeitskopie)
@@ -901,6 +901,7 @@
         } else {
             CHECK((newp = (Bucket*) apc_pmemcpy(curr, (sizeof(Bucket) + curr->nKeyLength), pool TSRMLS_CC)));
             newp->arKey = ((char*)newp) + sizeof(Bucket);
+            memcpy(newp->arKey, curr->arKey, curr->nKeyLength);
         }        
 #else
         CHECK((newp = (Bucket*) apc_pmemcpy(curr,










Test script:
---------------
php -d apc.enable_cli=1 -r '$tmp = array("foo" => "bar"); apc_add("tmp", $tmp); var_dump(apc_fetch("tmp")); '
array(1) {
  [""]=>
  string(3) "bar"
}


Expected result:
----------------
(Result with patch)

nixnutz@linux-0v4u:~/php-src/branches/PHP_5_4> sapi/cli/php -d apc.enable_cli=1 -r '$tmp = array("foo" => "bar"); apc_add("tmp", $tmp); var_dump(apc_fetch("tmp")); '
array(1) {
  ["foo"]=>
  string(3) "bar"
}



Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2012-01-21 04:57 UTC] rasmus@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: gopalv
 [2012-01-21 04:57 UTC] rasmus@php.net
Gopal, can you doublecheck this one?
 [2012-01-23 14:46 UTC] uw@php.net
Automatic comment from SVN on behalf of uw
Revision: http://svn.php.net/viewvc/?view=revision&revision=322628
Log: Make APC storage handler compile against APC trunk from PECL SVN. Note, it will fail until APC bug #60820 is fixed. Also note, that APC ZTS builds on 5.4 seem to be broken currently (bug #60805). In sum: do not use the APC storage handler at the moment.
 [2013-02-18 00:35 UTC] pecl-dev at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.
 
PHP Copyright © 2001-2021 The PHP Group
All rights reserved.
Last updated: Thu May 13 23:01:23 2021 UTC