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Bug #60820 User cache corruption: hash keys are lost
Submitted: 2012-01-20 18:40 UTC Modified: 2013-02-18 00:35 UTC
From: Assigned: gopalv (profile)
Status: No Feedback Package: APC (PECL)
PHP Version: 5.4SVN-2012-01-20 (SVN) OS:
Private report: No CVE-ID: None
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 [2012-01-20 18:40 UTC]
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);
         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) {
  string(3) "bar"


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 [2012-01-21 04:57 UTC]
-Status: Open +Status: Feedback -Assigned To: +Assigned To: gopalv
 [2012-01-21 04:57 UTC]
Gopal, can you doublecheck this one?
 [2012-01-23 14:46 UTC]
Automatic comment from SVN on behalf of uw
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
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