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Bug #41961 Search for overridden private methods strays from class hierarchy
Submitted: 2007-07-11 13:01 UTC Modified: 2007-07-12 10:32 UTC
From: robin_fernandes at uk dot ibm dot com Assigned: dmitry (profile)
Status: Closed Package: Scripting Engine problem
PHP Version: 5CVS-2007-07-11 (snap) OS: Linux
Private report: No CVE-ID: None
 [2007-07-11 13:01 UTC] robin_fernandes at uk dot ibm dot com
The wrong method is invoked if the following conditions are met:
1. A class has a public method that overrides/hides private method from its parent. 
2. An unrelated class has a public method of the same name.
3. The overriding method is invoked from within the unrelated class.

The unrelated class's method will be called instead of the overriding method. See the testcase below for an example.

Reproduce code:
The testcase is over 20 lines, but can be found here:

Expected result:
Called public ChildClass::secret() on an instance of: ChildClass

Actual result:
Called private X::secret() on an instance of: ChildClass


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 [2007-07-11 13:06 UTC] robin_fernandes at uk dot ibm dot com
Below is a _suggested_ fix to zend_object_handlers.c based on snap php5.2-200707111030. I have only tested on Linux using 'make test'.

Note that I am not highly familiar with the Zend Engine internals, so I could have overlooked a side effect or a better solution.

--- php5.2-theirs/Zend/zend_object_handlers.c 2007-03-23 17:30:59.000000000 +0000
+++ php5.2-mine/Zend/zend_object_handlers.c 2007-07-11 13:19:43.000000000 +0100
@@ -800,7 +800,7 @@
   /* Ensure that we haven't overridden a private function and end up calling
    * the overriding public function...
-  if (EG(scope) && fbc->op_array.fn_flags & ZEND_ACC_CHANGED) {
+  if (EG(scope) && is_derived_class(fbc->common.scope, EG(scope)) && fbc->op_array.fn_flags & ZEND_ACC_CHANGED) {
    zend_function *priv_fbc;

    if (zend_hash_find(&EG(scope)->function_table, lc_method_name, method_len+1, (void **) &priv_fbc)==SUCCESS
 [2007-07-11 14:06 UTC] robin_fernandes at uk dot ibm dot com
Sorry - step 2 in the description should read:
"2. An unrelated class has a *private* method of the same name."
 [2007-07-12 10:32 UTC]
This bug has been fixed in CVS.

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